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Finding the Fourth Proportional to 20,139.66, 30,207.15 and 5,349.74

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Solution

The fourth proportional to 20,139.66, 30,207.15 and 5,349.74 is: 8,023.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.66 : 30,207.15 = 5,349.74 : x
  2. Step 2: Convert to fraction form
    20,139.66/30,207.15 = 5,349.74/x
  3. Step 3: Cross multiply
    20,139.66x = 30,207.15 × 5,349.74
  4. Step 4: Simplify right side
    20,139.66x = 161,600,247.61
  5. Step 5: Solve for x
    x = 161,600,247.61/20,139.66
  6. Step 6: Final answer
    x = 8,023.98

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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.