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Finding the Fourth Proportional to 90,713.80, 136,070.70 and 67,385.80

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Solution

The fourth proportional to 90,713.80, 136,070.70 and 67,385.80 is: 101,078.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,713.80 : 136,070.70 = 67,385.80 : x
  2. Step 2: Convert to fraction form
    90,713.80/136,070.70 = 67,385.80/x
  3. Step 3: Cross multiply
    90,713.80x = 136,070.70 × 67,385.80
  4. Step 4: Simplify right side
    90,713.80x = 9,169,232,976.06
  5. Step 5: Solve for x
    x = 9,169,232,976.06/90,713.80
  6. Step 6: Final answer
    x = 101,078.70

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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.