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Finding the Fourth Proportional to 67,290.32, 100,935.89 and 20,543.20

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Solution

The fourth proportional to 67,290.32, 100,935.89 and 20,543.20 is: 30,814.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,290.32 : 100,935.89 = 20,543.20 : x
  2. Step 2: Convert to fraction form
    67,290.32/100,935.89 = 20,543.20/x
  3. Step 3: Cross multiply
    67,290.32x = 100,935.89 × 20,543.20
  4. Step 4: Simplify right side
    67,290.32x = 2,073,546,175.45
  5. Step 5: Solve for x
    x = 2,073,546,175.45/67,290.32
  6. Step 6: Final answer
    x = 30,814.93

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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.