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Finding the Fourth Proportional to 639,830.80, 960,077.40 and 261,029.20

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Solution

The fourth proportional to 639,830.80, 960,077.40 and 261,029.20 is: 391,678.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,830.80 : 960,077.40 = 261,029.20 : x
  2. Step 2: Convert to fraction form
    639,830.80/960,077.40 = 261,029.20/x
  3. Step 3: Cross multiply
    639,830.80x = 960,077.40 × 261,029.20
  4. Step 4: Simplify right side
    639,830.80x = 250,608,235,660.08
  5. Step 5: Solve for x
    x = 250,608,235,660.08/639,830.80
  6. Step 6: Final answer
    x = 391,678.92

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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.