Home / 85,839,981.90-128,759,972.85-76,434,132.30

Finding the Fourth Proportional to 85,839,981.90, 128,759,972.85 and 76,434,132.30

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Solution

The fourth proportional to 85,839,981.90, 128,759,972.85 and 76,434,132.30 is: 114,651,198.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,839,981.90 : 128,759,972.85 = 76,434,132.30 : x
  2. Step 2: Convert to fraction form
    85,839,981.90/128,759,972.85 = 76,434,132.30/x
  3. Step 3: Cross multiply
    85,839,981.90x = 128,759,972.85 × 76,434,132.30
  4. Step 4: Simplify right side
    85,839,981.90x = 9,841,656,799,761,308
  5. Step 5: Solve for x
    x = 9,841,656,799,761,308/85,839,981.90
  6. Step 6: Final answer
    x = 114,651,198.45

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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.