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Finding the Fourth Proportional to 85,812,796.80, 128,719,195.20 and 61,500,355.20

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Solution

The fourth proportional to 85,812,796.80, 128,719,195.20 and 61,500,355.20 is: 92,250,532.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,812,796.80 : 128,719,195.20 = 61,500,355.20 : x
  2. Step 2: Convert to fraction form
    85,812,796.80/128,719,195.20 = 61,500,355.20/x
  3. Step 3: Cross multiply
    85,812,796.80x = 128,719,195.20 × 61,500,355.20
  4. Step 4: Simplify right side
    85,812,796.80x = 7,916,276,225,858,136
  5. Step 5: Solve for x
    x = 7,916,276,225,858,136/85,812,796.80
  6. Step 6: Final answer
    x = 92,250,532.80

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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.