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Finding the Fourth Proportional to 85,812,711.20, 128,719,066.80 and 85,812,711.20

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Solution

The fourth proportional to 85,812,711.20, 128,719,066.80 and 85,812,711.20 is: 128,719,066.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812,711.20 : 128,719,066.80 = 85,812,711.20 : x
  2. Step 2: Convert to fraction form
    85,812,711.20/128,719,066.80 = 85,812,711.20/x
  3. Step 3: Cross multiply
    85,812,711.20x = 128,719,066.80 × 85,812,711.20
  4. Step 4: Simplify right side
    85,812,711.20x = 11,045,732,105,241,908
  5. Step 5: Solve for x
    x = 11,045,732,105,241,908/85,812,711.20
  6. Step 6: Final answer
    x = 128,719,066.80

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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.