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Finding the Fourth Proportional to 408,909.02, 613,461.90 and 172,319.36

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Solution

The fourth proportional to 408,909.02, 613,461.90 and 172,319.36 is: 258,520.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,909.02 : 613,461.90 = 172,319.36 : x
  2. Step 2: Convert to fraction form
    408,909.02/613,461.90 = 172,319.36/x
  3. Step 3: Cross multiply
    408,909.02x = 613,461.90 × 172,319.36
  4. Step 4: Simplify right side
    408,909.02x = 105,711,361,992.38
  5. Step 5: Solve for x
    x = 105,711,361,992.38/408,909.02
  6. Step 6: Final answer
    x = 258,520.49

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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.