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Finding the Fourth Proportional to 20,079.80, 30,119.70 and 9,711.80

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Solution

The fourth proportional to 20,079.80, 30,119.70 and 9,711.80 is: 14,567.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,079.80 : 30,119.70 = 9,711.80 : x
  2. Step 2: Convert to fraction form
    20,079.80/30,119.70 = 9,711.80/x
  3. Step 3: Cross multiply
    20,079.80x = 30,119.70 × 9,711.80
  4. Step 4: Simplify right side
    20,079.80x = 292,516,502.46
  5. Step 5: Solve for x
    x = 292,516,502.46/20,079.80
  6. Step 6: Final answer
    x = 14,567.70

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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.