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Finding the Fourth Proportional to 90,689.50, 136,037.30 and 40,769.74

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Solution

The fourth proportional to 90,689.50, 136,037.30 and 40,769.74 is: 61,155.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,689.50 : 136,037.30 = 40,769.74 : x
  2. Step 2: Convert to fraction form
    90,689.50/136,037.30 = 40,769.74/x
  3. Step 3: Cross multiply
    90,689.50x = 136,037.30 × 40,769.74
  4. Step 4: Simplify right side
    90,689.50x = 5,546,205,351.30
  5. Step 5: Solve for x
    x = 5,546,205,351.30/90,689.50
  6. Step 6: Final answer
    x = 61,155.98

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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.