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Finding the Fourth Proportional to 721,777.64, 996,041.07 and 399,480.86

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Solution

The fourth proportional to 721,777.64, 996,041.07 and 399,480.86 is: 551,276.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,777.64 : 996,041.07 = 399,480.86 : x
  2. Step 2: Convert to fraction form
    721,777.64/996,041.07 = 399,480.86/x
  3. Step 3: Cross multiply
    721,777.64x = 996,041.07 × 399,480.86
  4. Step 4: Simplify right side
    721,777.64x = 397,899,345,729.02
  5. Step 5: Solve for x
    x = 397,899,345,729.02/721,777.64
  6. Step 6: Final answer
    x = 551,276.91

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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.