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Finding the Fourth Proportional to 21,998.80, 30,358.14 and 11,927.20

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Solution

The fourth proportional to 21,998.80, 30,358.14 and 11,927.20 is: 16,459.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,998.80 : 30,358.14 = 11,927.20 : x
  2. Step 2: Convert to fraction form
    21,998.80/30,358.14 = 11,927.20/x
  3. Step 3: Cross multiply
    21,998.80x = 30,358.14 × 11,927.20
  4. Step 4: Simplify right side
    21,998.80x = 362,087,607.41
  5. Step 5: Solve for x
    x = 362,087,607.41/21,998.80
  6. Step 6: Final answer
    x = 16,459.43

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.