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Finding the Fourth Proportional to 639,835.80, 960,084.90 and 261,034.20

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Solution

The fourth proportional to 639,835.80, 960,084.90 and 261,034.20 is: 391,686.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,835.80 : 960,084.90 = 261,034.20 : x
  2. Step 2: Convert to fraction form
    639,835.80/960,084.90 = 261,034.20/x
  3. Step 3: Cross multiply
    639,835.80x = 960,084.90 × 261,034.20
  4. Step 4: Simplify right side
    639,835.80x = 250,614,993,803.58
  5. Step 5: Solve for x
    x = 250,614,993,803.58/639,835.80
  6. Step 6: Final answer
    x = 391,686.42

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Double scale
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1.5x scale

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.