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Finding the Fourth Proportional to 721,745.76, 996,011.28 and 399,478.24

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Solution

The fourth proportional to 721,745.76, 996,011.28 and 399,478.24 is: 551,281.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,745.76 : 996,011.28 = 399,478.24 : x
  2. Step 2: Convert to fraction form
    721,745.76/996,011.28 = 399,478.24/x
  3. Step 3: Cross multiply
    721,745.76x = 996,011.28 × 399,478.24
  4. Step 4: Simplify right side
    721,745.76x = 397,884,833,154.55
  5. Step 5: Solve for x
    x = 397,884,833,154.55/721,745.76
  6. Step 6: Final answer
    x = 551,281.15

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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.