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Finding the Fourth Proportional to 153,979.20, 231,071.20 and 87,419.20

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Solution

The fourth proportional to 153,979.20, 231,071.20 and 87,419.20 is: 131,186.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,979.20 : 231,071.20 = 87,419.20 : x
  2. Step 2: Convert to fraction form
    153,979.20/231,071.20 = 87,419.20/x
  3. Step 3: Cross multiply
    153,979.20x = 231,071.20 × 87,419.20
  4. Step 4: Simplify right side
    153,979.20x = 20,200,059,447.04
  5. Step 5: Solve for x
    x = 20,200,059,447.04/153,979.20
  6. Step 6: Final answer
    x = 131,186.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.