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Finding the Fourth Proportional to 90,694.20, 136,041.30 and 89,819.40

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Solution

The fourth proportional to 90,694.20, 136,041.30 and 89,819.40 is: 134,729.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,694.20 : 136,041.30 = 89,819.40 : x
  2. Step 2: Convert to fraction form
    90,694.20/136,041.30 = 89,819.40/x
  3. Step 3: Cross multiply
    90,694.20x = 136,041.30 × 89,819.40
  4. Step 4: Simplify right side
    90,694.20x = 12,219,147,941.22
  5. Step 5: Solve for x
    x = 12,219,147,941.22/90,694.20
  6. Step 6: Final answer
    x = 134,729.10

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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.