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Finding the Fourth Proportional to 721,458.84, 995,642.56 and 399,163.72

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Solution

The fourth proportional to 721,458.84, 995,642.56 and 399,163.72 is: 550,862.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,458.84 : 995,642.56 = 399,163.72 : x
  2. Step 2: Convert to fraction form
    721,458.84/995,642.56 = 399,163.72/x
  3. Step 3: Cross multiply
    721,458.84x = 995,642.56 × 399,163.72
  4. Step 4: Simplify right side
    721,458.84x = 397,424,388,039.92
  5. Step 5: Solve for x
    x = 397,424,388,039.92/721,458.84
  6. Step 6: Final answer
    x = 550,862.18

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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.