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Finding the Fourth Proportional to 721,002.63, 994,990.10 and 398,734.50

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Solution

The fourth proportional to 721,002.63, 994,990.10 and 398,734.50 is: 550,257.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,002.63 : 994,990.10 = 398,734.50 : x
  2. Step 2: Convert to fraction form
    721,002.63/994,990.10 = 398,734.50/x
  3. Step 3: Cross multiply
    721,002.63x = 994,990.10 × 398,734.50
  4. Step 4: Simplify right side
    721,002.63x = 396,736,878,034.78
  5. Step 5: Solve for x
    x = 396,736,878,034.78/721,002.63
  6. Step 6: Final answer
    x = 550,257.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.