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Finding the Fourth Proportional to 85,834,136.80, 128,751,205.20 and 76,428,287.20

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Solution

The fourth proportional to 85,834,136.80, 128,751,205.20 and 76,428,287.20 is: 114,642,430.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,834,136.80 : 128,751,205.20 = 76,428,287.20 : x
  2. Step 2: Convert to fraction form
    85,834,136.80/128,751,205.20 = 76,428,287.20/x
  3. Step 3: Cross multiply
    85,834,136.80x = 128,751,205.20 × 76,428,287.20
  4. Step 4: Simplify right side
    85,834,136.80x = 9,840,234,088,371,734
  5. Step 5: Solve for x
    x = 9,840,234,088,371,734/85,834,136.80
  6. Step 6: Final answer
    x = 114,642,430.80

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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.