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Finding the Fourth Proportional to 20,712, 28,591.44 and 14,006.88

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Solution

The fourth proportional to 20,712, 28,591.44 and 14,006.88 is: 19,335.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712 : 28,591.44 = 14,006.88 : x
  2. Step 2: Convert to fraction form
    20,712/28,591.44 = 14,006.88/x
  3. Step 3: Cross multiply
    20,712x = 28,591.44 × 14,006.88
  4. Step 4: Simplify right side
    20,712x = 400,476,869.11
  5. Step 5: Solve for x
    x = 400,476,869.11/20,712
  6. Step 6: Final answer
    x = 19,335.50

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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.