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Finding the Fourth Proportional to 20,679.87, 28,548.14 and 12,728.91

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Solution

The fourth proportional to 20,679.87, 28,548.14 and 12,728.91 is: 17,572.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,679.87 : 28,548.14 = 12,728.91 : x
  2. Step 2: Convert to fraction form
    20,679.87/28,548.14 = 12,728.91/x
  3. Step 3: Cross multiply
    20,679.87x = 28,548.14 × 12,728.91
  4. Step 4: Simplify right side
    20,679.87x = 363,386,641.08
  5. Step 5: Solve for x
    x = 363,386,641.08/20,679.87
  6. Step 6: Final answer
    x = 17,572.00

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