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Finding the Fourth Proportional to 86,387, 129,582.52 and 23,207.20

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Solution

The fourth proportional to 86,387, 129,582.52 and 23,207.20 is: 34,811.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,387 : 129,582.52 = 23,207.20 : x
  2. Step 2: Convert to fraction form
    86,387/129,582.52 = 23,207.20/x
  3. Step 3: Cross multiply
    86,387x = 129,582.52 × 23,207.20
  4. Step 4: Simplify right side
    86,387x = 3,007,247,458.14
  5. Step 5: Solve for x
    x = 3,007,247,458.14/86,387
  6. Step 6: Final answer
    x = 34,811.34

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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.