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Finding the Fourth Proportional to 721,874.10, 996,195.06 and 399,613.98

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Solution

The fourth proportional to 721,874.10, 996,195.06 and 399,613.98 is: 551,472.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,874.10 : 996,195.06 = 399,613.98 : x
  2. Step 2: Convert to fraction form
    721,874.10/996,195.06 = 399,613.98/x
  3. Step 3: Cross multiply
    721,874.10x = 996,195.06 × 399,613.98
  4. Step 4: Simplify right side
    721,874.10x = 398,093,472,782.94
  5. Step 5: Solve for x
    x = 398,093,472,782.94/721,874.10
  6. Step 6: Final answer
    x = 551,472.16

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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.