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Finding the Fourth Proportional to 90,350.40, 135,655.20 and 68,318.40

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Solution

The fourth proportional to 90,350.40, 135,655.20 and 68,318.40 is: 102,575.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,350.40 : 135,655.20 = 68,318.40 : x
  2. Step 2: Convert to fraction form
    90,350.40/135,655.20 = 68,318.40/x
  3. Step 3: Cross multiply
    90,350.40x = 135,655.20 × 68,318.40
  4. Step 4: Simplify right side
    90,350.40x = 9,267,746,215.68
  5. Step 5: Solve for x
    x = 9,267,746,215.68/90,350.40
  6. Step 6: Final answer
    x = 102,575.60

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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.