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Finding the Fourth Proportional to 20,760, 28,644.48 and 14,046.72

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Solution

The fourth proportional to 20,760, 28,644.48 and 14,046.72 is: 19,381.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,760 : 28,644.48 = 14,046.72 : x
  2. Step 2: Convert to fraction form
    20,760/28,644.48 = 14,046.72/x
  3. Step 3: Cross multiply
    20,760x = 28,644.48 × 14,046.72
  4. Step 4: Simplify right side
    20,760x = 402,360,990.11
  5. Step 5: Solve for x
    x = 402,360,990.11/20,760
  6. Step 6: Final answer
    x = 19,381.55

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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.