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Finding the Fourth Proportional to 67,731.80, 101,597.70 and 20,989.40

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Solution

The fourth proportional to 67,731.80, 101,597.70 and 20,989.40 is: 31,484.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,731.80 : 101,597.70 = 20,989.40 : x
  2. Step 2: Convert to fraction form
    67,731.80/101,597.70 = 20,989.40/x
  3. Step 3: Cross multiply
    67,731.80x = 101,597.70 × 20,989.40
  4. Step 4: Simplify right side
    67,731.80x = 2,132,474,764.38
  5. Step 5: Solve for x
    x = 2,132,474,764.38/67,731.80
  6. Step 6: Final answer
    x = 31,484.10

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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.