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Finding the Fourth Proportional to 90,743.40, 136,244.70 and 68,711.40

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Solution

The fourth proportional to 90,743.40, 136,244.70 and 68,711.40 is: 103,165.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,743.40 : 136,244.70 = 68,711.40 : x
  2. Step 2: Convert to fraction form
    90,743.40/136,244.70 = 68,711.40/x
  3. Step 3: Cross multiply
    90,743.40x = 136,244.70 × 68,711.40
  4. Step 4: Simplify right side
    90,743.40x = 9,361,564,079.58
  5. Step 5: Solve for x
    x = 9,361,564,079.58/90,743.40
  6. Step 6: Final answer
    x = 103,165.23

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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.