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Finding the Fourth Proportional to 639,825.30, 960,069.15 and 261,023.70

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Solution

The fourth proportional to 639,825.30, 960,069.15 and 261,023.70 is: 391,670.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,825.30 : 960,069.15 = 261,023.70 : x
  2. Step 2: Convert to fraction form
    639,825.30/960,069.15 = 261,023.70/x
  3. Step 3: Cross multiply
    639,825.30x = 960,069.15 × 261,023.70
  4. Step 4: Simplify right side
    639,825.30x = 250,600,801,788.86
  5. Step 5: Solve for x
    x = 250,600,801,788.86/639,825.30
  6. Step 6: Final answer
    x = 391,670.67

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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.