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Finding the Fourth Proportional to 18,871.42, 28,307.38 and 7,185.28

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Solution

The fourth proportional to 18,871.42, 28,307.38 and 7,185.28 is: 10,778.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.42 : 28,307.38 = 7,185.28 : x
  2. Step 2: Convert to fraction form
    18,871.42/28,307.38 = 7,185.28/x
  3. Step 3: Cross multiply
    18,871.42x = 28,307.38 × 7,185.28
  4. Step 4: Simplify right side
    18,871.42x = 203,396,451.37
  5. Step 5: Solve for x
    x = 203,396,451.37/18,871.42
  6. Step 6: Final answer
    x = 10,778.02

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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.