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Finding the Fourth Proportional to 20,642.42, 28,472.04 and 12,689.04

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Solution

The fourth proportional to 20,642.42, 28,472.04 and 12,689.04 is: 17,501.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,642.42 : 28,472.04 = 12,689.04 : x
  2. Step 2: Convert to fraction form
    20,642.42/28,472.04 = 12,689.04/x
  3. Step 3: Cross multiply
    20,642.42x = 28,472.04 × 12,689.04
  4. Step 4: Simplify right side
    20,642.42x = 361,282,854.44
  5. Step 5: Solve for x
    x = 361,282,854.44/20,642.42
  6. Step 6: Final answer
    x = 17,501.96

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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.