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Finding the Fourth Proportional to 157,642.77, 217,490.16 and 121,355.31

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Solution

The fourth proportional to 157,642.77, 217,490.16 and 121,355.31 is: 167,426.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,642.77 : 217,490.16 = 121,355.31 : x
  2. Step 2: Convert to fraction form
    157,642.77/217,490.16 = 121,355.31/x
  3. Step 3: Cross multiply
    157,642.77x = 217,490.16 × 121,355.31
  4. Step 4: Simplify right side
    157,642.77x = 26,393,587,059.42
  5. Step 5: Solve for x
    x = 26,393,587,059.42/157,642.77
  6. Step 6: Final answer
    x = 167,426.56

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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.