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Finding the Fourth Proportional to 86,719, 119,691.50 and 52,720.28

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Solution

The fourth proportional to 86,719, 119,691.50 and 52,720.28 is: 72,765.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,719 : 119,691.50 = 52,720.28 : x
  2. Step 2: Convert to fraction form
    86,719/119,691.50 = 52,720.28/x
  3. Step 3: Cross multiply
    86,719x = 119,691.50 × 52,720.28
  4. Step 4: Simplify right side
    86,719x = 6,310,169,393.62
  5. Step 5: Solve for x
    x = 6,310,169,393.62/86,719
  6. Step 6: Final answer
    x = 72,765.71

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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.