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Finding the Fourth Proportional to 157,411.72, 217,221.85 and 85,790.21

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Solution

The fourth proportional to 157,411.72, 217,221.85 and 85,790.21 is: 118,387.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,411.72 : 217,221.85 = 85,790.21 : x
  2. Step 2: Convert to fraction form
    157,411.72/217,221.85 = 85,790.21/x
  3. Step 3: Cross multiply
    157,411.72x = 217,221.85 × 85,790.21
  4. Step 4: Simplify right side
    157,411.72x = 18,635,507,149.22
  5. Step 5: Solve for x
    x = 18,635,507,149.22/157,411.72
  6. Step 6: Final answer
    x = 118,387.04

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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.