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Finding the Fourth Proportional to 90,873.70, 136,310.55 and 86,791.30

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Solution

The fourth proportional to 90,873.70, 136,310.55 and 86,791.30 is: 130,186.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,873.70 : 136,310.55 = 86,791.30 : x
  2. Step 2: Convert to fraction form
    90,873.70/136,310.55 = 86,791.30/x
  3. Step 3: Cross multiply
    90,873.70x = 136,310.55 × 86,791.30
  4. Step 4: Simplify right side
    90,873.70x = 11,830,569,838.22
  5. Step 5: Solve for x
    x = 11,830,569,838.22/90,873.70
  6. Step 6: Final answer
    x = 130,186.95

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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.