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Finding the Fourth Proportional to 639,720.48, 959,062.20 and 266,023.20

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Solution

The fourth proportional to 639,720.48, 959,062.20 and 266,023.20 is: 398,819.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,720.48 : 959,062.20 = 266,023.20 : x
  2. Step 2: Convert to fraction form
    639,720.48/959,062.20 = 266,023.20/x
  3. Step 3: Cross multiply
    639,720.48x = 959,062.20 × 266,023.20
  4. Step 4: Simplify right side
    639,720.48x = 255,132,795,443.04
  5. Step 5: Solve for x
    x = 255,132,795,443.04/639,720.48
  6. Step 6: Final answer
    x = 398,819.18

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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.