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Finding the Fourth Proportional to 20,671.52, 28,526.11 and 12,712.46

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Solution

The fourth proportional to 20,671.52, 28,526.11 and 12,712.46 is: 17,542.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,671.52 : 28,526.11 = 12,712.46 : x
  2. Step 2: Convert to fraction form
    20,671.52/28,526.11 = 12,712.46/x
  3. Step 3: Cross multiply
    20,671.52x = 28,526.11 × 12,712.46
  4. Step 4: Simplify right side
    20,671.52x = 362,636,857.92
  5. Step 5: Solve for x
    x = 362,636,857.92/20,671.52
  6. Step 6: Final answer
    x = 17,542.83

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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.