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Finding the Fourth Proportional to 28,644.48, 42,929.12 and 20,773.44

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Solution

The fourth proportional to 28,644.48, 42,929.12 and 20,773.44 is: 31,132.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,644.48 : 42,929.12 = 20,773.44 : x
  2. Step 2: Convert to fraction form
    28,644.48/42,929.12 = 20,773.44/x
  3. Step 3: Cross multiply
    28,644.48x = 42,929.12 × 20,773.44
  4. Step 4: Simplify right side
    28,644.48x = 891,785,498.57
  5. Step 5: Solve for x
    x = 891,785,498.57/28,644.48
  6. Step 6: Final answer
    x = 31,132.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.