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Finding the Fourth Proportional to 67,742.60, 101,613.90 and 21,000.20

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Solution

The fourth proportional to 67,742.60, 101,613.90 and 21,000.20 is: 31,500.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,742.60 : 101,613.90 = 21,000.20 : x
  2. Step 2: Convert to fraction form
    67,742.60/101,613.90 = 21,000.20/x
  3. Step 3: Cross multiply
    67,742.60x = 101,613.90 × 21,000.20
  4. Step 4: Simplify right side
    67,742.60x = 2,133,912,222.78
  5. Step 5: Solve for x
    x = 2,133,912,222.78/67,742.60
  6. Step 6: Final answer
    x = 31,500.30

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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.