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Finding the Fourth Proportional to 21,575.20, 32,358.48 and 8,428

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Solution

The fourth proportional to 21,575.20, 32,358.48 and 8,428 is: 12,640.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,575.20 : 32,358.48 = 8,428 : x
  2. Step 2: Convert to fraction form
    21,575.20/32,358.48 = 8,428/x
  3. Step 3: Cross multiply
    21,575.20x = 32,358.48 × 8,428
  4. Step 4: Simplify right side
    21,575.20x = 272,717,269.44
  5. Step 5: Solve for x
    x = 272,717,269.44/21,575.20
  6. Step 6: Final answer
    x = 12,640.31

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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.