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Finding the Fourth Proportional to 639,840.80, 960,092.40 and 261,039.20

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Solution

The fourth proportional to 639,840.80, 960,092.40 and 261,039.20 is: 391,693.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,840.80 : 960,092.40 = 261,039.20 : x
  2. Step 2: Convert to fraction form
    639,840.80/960,092.40 = 261,039.20/x
  3. Step 3: Cross multiply
    639,840.80x = 960,092.40 × 261,039.20
  4. Step 4: Simplify right side
    639,840.80x = 250,621,752,022.08
  5. Step 5: Solve for x
    x = 250,621,752,022.08/639,840.80
  6. Step 6: Final answer
    x = 391,693.92

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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.