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Finding the Fourth Proportional to 158,123.31, 218,211.90 and 86,501.79

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Solution

The fourth proportional to 158,123.31, 218,211.90 and 86,501.79 is: 119,373.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,123.31 : 218,211.90 = 86,501.79 : x
  2. Step 2: Convert to fraction form
    158,123.31/218,211.90 = 86,501.79/x
  3. Step 3: Cross multiply
    158,123.31x = 218,211.90 × 86,501.79
  4. Step 4: Simplify right side
    158,123.31x = 18,875,719,624.92
  5. Step 5: Solve for x
    x = 18,875,719,624.92/158,123.31
  6. Step 6: Final answer
    x = 119,373.42

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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.