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Finding the Fourth Proportional to 20,572.59, 28,390.19 and 11,141.16

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Solution

The fourth proportional to 20,572.59, 28,390.19 and 11,141.16 is: 15,374.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.59 : 28,390.19 = 11,141.16 : x
  2. Step 2: Convert to fraction form
    20,572.59/28,390.19 = 11,141.16/x
  3. Step 3: Cross multiply
    20,572.59x = 28,390.19 × 11,141.16
  4. Step 4: Simplify right side
    20,572.59x = 316,299,487.05
  5. Step 5: Solve for x
    x = 316,299,487.05/20,572.59
  6. Step 6: Final answer
    x = 15,374.80

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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.