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Finding the Fourth Proportional to 721,784.64, 996,050.72 and 399,487.88

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Solution

The fourth proportional to 721,784.64, 996,050.72 and 399,487.88 is: 551,286.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,784.64 : 996,050.72 = 399,487.88 : x
  2. Step 2: Convert to fraction form
    721,784.64/996,050.72 = 399,487.88/x
  3. Step 3: Cross multiply
    721,784.64x = 996,050.72 × 399,487.88
  4. Step 4: Simplify right side
    721,784.64x = 397,910,190,505.27
  5. Step 5: Solve for x
    x = 397,910,190,505.27/721,784.64
  6. Step 6: Final answer
    x = 551,286.59

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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.