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Finding the Fourth Proportional to 86,015,892.80, 129,023,839.20 and 25,431,618.80

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Solution

The fourth proportional to 86,015,892.80, 129,023,839.20 and 25,431,618.80 is: 38,147,428.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,015,892.80 : 129,023,839.20 = 25,431,618.80 : x
  2. Step 2: Convert to fraction form
    86,015,892.80/129,023,839.20 = 25,431,618.80/x
  3. Step 3: Cross multiply
    86,015,892.80x = 129,023,839.20 × 25,431,618.80
  4. Step 4: Simplify right side
    86,015,892.80x = 3,281,285,094,646,897
  5. Step 5: Solve for x
    x = 3,281,285,094,646,897/86,015,892.80
  6. Step 6: Final answer
    x = 38,147,428.20

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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.