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Finding the Fourth Proportional to 20,479.20, 30,718.80 and 7,332.60

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Solution

The fourth proportional to 20,479.20, 30,718.80 and 7,332.60 is: 10,998.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.20 : 30,718.80 = 7,332.60 : x
  2. Step 2: Convert to fraction form
    20,479.20/30,718.80 = 7,332.60/x
  3. Step 3: Cross multiply
    20,479.20x = 30,718.80 × 7,332.60
  4. Step 4: Simplify right side
    20,479.20x = 225,248,672.88
  5. Step 5: Solve for x
    x = 225,248,672.88/20,479.20
  6. Step 6: Final answer
    x = 10,998.90

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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.