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Finding the Fourth Proportional to 665,445.60, 996,856.20 and 398,412.90

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Solution

The fourth proportional to 665,445.60, 996,856.20 and 398,412.90 is: 596,833.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,445.60 : 996,856.20 = 398,412.90 : x
  2. Step 2: Convert to fraction form
    665,445.60/996,856.20 = 398,412.90/x
  3. Step 3: Cross multiply
    665,445.60x = 996,856.20 × 398,412.90
  4. Step 4: Simplify right side
    665,445.60x = 397,160,369,524.98
  5. Step 5: Solve for x
    x = 397,160,369,524.98/665,445.60
  6. Step 6: Final answer
    x = 596,833.71

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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.