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Finding the Fourth Proportional to 90,690.20, 136,035.30 and 89,815.40

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Solution

The fourth proportional to 90,690.20, 136,035.30 and 89,815.40 is: 134,723.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,690.20 : 136,035.30 = 89,815.40 : x
  2. Step 2: Convert to fraction form
    90,690.20/136,035.30 = 89,815.40/x
  3. Step 3: Cross multiply
    90,690.20x = 136,035.30 × 89,815.40
  4. Step 4: Simplify right side
    90,690.20x = 12,218,064,883.62
  5. Step 5: Solve for x
    x = 12,218,064,883.62/90,690.20
  6. Step 6: Final answer
    x = 134,723.10

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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.