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Finding the Fourth Proportional to 14,649.20, 20,215.64 and 7,934.78

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Solution

The fourth proportional to 14,649.20, 20,215.64 and 7,934.78 is: 10,949.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,649.20 : 20,215.64 = 7,934.78 : x
  2. Step 2: Convert to fraction form
    14,649.20/20,215.64 = 7,934.78/x
  3. Step 3: Cross multiply
    14,649.20x = 20,215.64 × 7,934.78
  4. Step 4: Simplify right side
    14,649.20x = 160,406,655.96
  5. Step 5: Solve for x
    x = 160,406,655.96/14,649.20
  6. Step 6: Final answer
    x = 10,949.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.