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Finding the Fourth Proportional to 721,961.76, 996,294.72 and 399,664.80

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Solution

The fourth proportional to 721,961.76, 996,294.72 and 399,664.80 is: 551,530.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,961.76 : 996,294.72 = 399,664.80 : x
  2. Step 2: Convert to fraction form
    721,961.76/996,294.72 = 399,664.80/x
  3. Step 3: Cross multiply
    721,961.76x = 996,294.72 × 399,664.80
  4. Step 4: Simplify right side
    721,961.76x = 398,183,930,009.86
  5. Step 5: Solve for x
    x = 398,183,930,009.86/721,961.76
  6. Step 6: Final answer
    x = 551,530.50

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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.