Home / 90,639.20-136,220.88-84,339.68

Finding the Fourth Proportional to 90,639.20, 136,220.88 and 84,339.68

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Solution

The fourth proportional to 90,639.20, 136,220.88 and 84,339.68 is: 126,753.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,639.20 : 136,220.88 = 84,339.68 : x
  2. Step 2: Convert to fraction form
    90,639.20/136,220.88 = 84,339.68/x
  3. Step 3: Cross multiply
    90,639.20x = 136,220.88 × 84,339.68
  4. Step 4: Simplify right side
    90,639.20x = 11,488,825,428.52
  5. Step 5: Solve for x
    x = 11,488,825,428.52/90,639.20
  6. Step 6: Final answer
    x = 126,753.39

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1.5x scale

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.