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Finding the Fourth Proportional to 42,608.80, 63,913.20 and 21,872.80

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Solution

The fourth proportional to 42,608.80, 63,913.20 and 21,872.80 is: 32,809.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,608.80 : 63,913.20 = 21,872.80 : x
  2. Step 2: Convert to fraction form
    42,608.80/63,913.20 = 21,872.80/x
  3. Step 3: Cross multiply
    42,608.80x = 63,913.20 × 21,872.80
  4. Step 4: Simplify right side
    42,608.80x = 1,397,960,640.96
  5. Step 5: Solve for x
    x = 1,397,960,640.96/42,608.80
  6. Step 6: Final answer
    x = 32,809.20

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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.