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Finding the Fourth Proportional to 157,326.12, 217,107.54 and 85,707

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Solution

The fourth proportional to 157,326.12, 217,107.54 and 85,707 is: 118,274.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,326.12 : 217,107.54 = 85,707 : x
  2. Step 2: Convert to fraction form
    157,326.12/217,107.54 = 85,707/x
  3. Step 3: Cross multiply
    157,326.12x = 217,107.54 × 85,707
  4. Step 4: Simplify right side
    157,326.12x = 18,607,635,930.78
  5. Step 5: Solve for x
    x = 18,607,635,930.78/157,326.12
  6. Step 6: Final answer
    x = 118,274.30

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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.