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Finding the Fourth Proportional to 18,871.40, 28,307.10 and 10,998.20

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Solution

The fourth proportional to 18,871.40, 28,307.10 and 10,998.20 is: 16,497.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.40 : 28,307.10 = 10,998.20 : x
  2. Step 2: Convert to fraction form
    18,871.40/28,307.10 = 10,998.20/x
  3. Step 3: Cross multiply
    18,871.40x = 28,307.10 × 10,998.20
  4. Step 4: Simplify right side
    18,871.40x = 311,327,147.22
  5. Step 5: Solve for x
    x = 311,327,147.22/18,871.40
  6. Step 6: Final answer
    x = 16,497.30

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.