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Finding the Fourth Proportional to 90,964.20, 136,446.30 and 86,881.80

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Solution

The fourth proportional to 90,964.20, 136,446.30 and 86,881.80 is: 130,322.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,964.20 : 136,446.30 = 86,881.80 : x
  2. Step 2: Convert to fraction form
    90,964.20/136,446.30 = 86,881.80/x
  3. Step 3: Cross multiply
    90,964.20x = 136,446.30 × 86,881.80
  4. Step 4: Simplify right side
    90,964.20x = 11,854,700,147.34
  5. Step 5: Solve for x
    x = 11,854,700,147.34/90,964.20
  6. Step 6: Final answer
    x = 130,322.70

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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.