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Finding the Fourth Proportional to 111,399.76, 153,712.40 and 62,979.56

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Solution

The fourth proportional to 111,399.76, 153,712.40 and 62,979.56 is: 86,900.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,399.76 : 153,712.40 = 62,979.56 : x
  2. Step 2: Convert to fraction form
    111,399.76/153,712.40 = 62,979.56/x
  3. Step 3: Cross multiply
    111,399.76x = 153,712.40 × 62,979.56
  4. Step 4: Simplify right side
    111,399.76x = 9,680,739,318.54
  5. Step 5: Solve for x
    x = 9,680,739,318.54/111,399.76
  6. Step 6: Final answer
    x = 86,900.90

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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.