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Finding the Fourth Proportional to 85,812,814.20, 128,719,221.30 and 85,812,814.20

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Solution

The fourth proportional to 85,812,814.20, 128,719,221.30 and 85,812,814.20 is: 128,719,221.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812,814.20 : 128,719,221.30 = 85,812,814.20 : x
  2. Step 2: Convert to fraction form
    85,812,814.20/128,719,221.30 = 85,812,814.20/x
  3. Step 3: Cross multiply
    85,812,814.20x = 128,719,221.30 × 85,812,814.20
  4. Step 4: Simplify right side
    85,812,814.20x = 11,045,758,621,385,582
  5. Step 5: Solve for x
    x = 11,045,758,621,385,582/85,812,814.20
  6. Step 6: Final answer
    x = 128,719,221.30

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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.