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Finding the Fourth Proportional to 90,601.30, 135,901.95 and 77,187.70

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Solution

The fourth proportional to 90,601.30, 135,901.95 and 77,187.70 is: 115,781.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,601.30 : 135,901.95 = 77,187.70 : x
  2. Step 2: Convert to fraction form
    90,601.30/135,901.95 = 77,187.70/x
  3. Step 3: Cross multiply
    90,601.30x = 135,901.95 × 77,187.70
  4. Step 4: Simplify right side
    90,601.30x = 10,489,958,946.02
  5. Step 5: Solve for x
    x = 10,489,958,946.02/90,601.30
  6. Step 6: Final answer
    x = 115,781.55

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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.