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Finding the Fourth Proportional to 721,962.34, 996,275.72 and 399,649.66

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Solution

The fourth proportional to 721,962.34, 996,275.72 and 399,649.66 is: 551,498.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,962.34 : 996,275.72 = 399,649.66 : x
  2. Step 2: Convert to fraction form
    721,962.34/996,275.72 = 399,649.66/x
  3. Step 3: Cross multiply
    721,962.34x = 996,275.72 × 399,649.66
  4. Step 4: Simplify right side
    721,962.34x = 398,161,252,764.26
  5. Step 5: Solve for x
    x = 398,161,252,764.26/721,962.34
  6. Step 6: Final answer
    x = 551,498.65

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Double scale
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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.