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Finding the Fourth Proportional to 665,451.60, 996,865.20 and 398,418.90

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Solution

The fourth proportional to 665,451.60, 996,865.20 and 398,418.90 is: 596,842.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,451.60 : 996,865.20 = 398,418.90 : x
  2. Step 2: Convert to fraction form
    665,451.60/996,865.20 = 398,418.90/x
  3. Step 3: Cross multiply
    665,451.60x = 996,865.20 × 398,418.90
  4. Step 4: Simplify right side
    665,451.60x = 397,169,936,432.28
  5. Step 5: Solve for x
    x = 397,169,936,432.28/665,451.60
  6. Step 6: Final answer
    x = 596,842.71

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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.