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Finding the Fourth Proportional to 157,979.57, 218,011.87 and 86,359.57

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Solution

The fourth proportional to 157,979.57, 218,011.87 and 86,359.57 is: 119,176.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    157,979.57 : 218,011.87 = 86,359.57 : x
  2. Step 2: Convert to fraction form
    157,979.57/218,011.87 = 86,359.57/x
  3. Step 3: Cross multiply
    157,979.57x = 218,011.87 × 86,359.57
  4. Step 4: Simplify right side
    157,979.57x = 18,827,411,348.10
  5. Step 5: Solve for x
    x = 18,827,411,348.10/157,979.57
  6. Step 6: Final answer
    x = 119,176.24

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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.