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Finding the Fourth Proportional to 639,820.80, 960,062.40 and 261,019.20

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Solution

The fourth proportional to 639,820.80, 960,062.40 and 261,019.20 is: 391,663.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,820.80 : 960,062.40 = 261,019.20 : x
  2. Step 2: Convert to fraction form
    639,820.80/960,062.40 = 261,019.20/x
  3. Step 3: Cross multiply
    639,820.80x = 960,062.40 × 261,019.20
  4. Step 4: Simplify right side
    639,820.80x = 250,594,719,598.08
  5. Step 5: Solve for x
    x = 250,594,719,598.08/639,820.80
  6. Step 6: Final answer
    x = 391,663.92

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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.