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Finding the Fourth Proportional to 90,948.60, 136,422.90 and 87,449.40

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Solution

The fourth proportional to 90,948.60, 136,422.90 and 87,449.40 is: 131,174.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,948.60 : 136,422.90 = 87,449.40 : x
  2. Step 2: Convert to fraction form
    90,948.60/136,422.90 = 87,449.40/x
  3. Step 3: Cross multiply
    90,948.60x = 136,422.90 × 87,449.40
  4. Step 4: Simplify right side
    90,948.60x = 11,930,100,751.26
  5. Step 5: Solve for x
    x = 11,930,100,751.26/90,948.60
  6. Step 6: Final answer
    x = 131,174.10

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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.