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Finding the Fourth Proportional to 721,240.30, 995,299.32 and 398,950.13

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Solution

The fourth proportional to 721,240.30, 995,299.32 and 398,950.13 is: 550,544.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,240.30 : 995,299.32 = 398,950.13 : x
  2. Step 2: Convert to fraction form
    721,240.30/995,299.32 = 398,950.13/x
  3. Step 3: Cross multiply
    721,240.30x = 995,299.32 × 398,950.13
  4. Step 4: Simplify right side
    721,240.30x = 397,074,793,102.91
  5. Step 5: Solve for x
    x = 397,074,793,102.91/721,240.30
  6. Step 6: Final answer
    x = 550,544.38

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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.