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Finding the Fourth Proportional to 721,247.80, 995,309.66 and 398,957.64

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Solution

The fourth proportional to 721,247.80, 995,309.66 and 398,957.64 is: 550,554.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,247.80 : 995,309.66 = 398,957.64 : x
  2. Step 2: Convert to fraction form
    721,247.80/995,309.66 = 398,957.64/x
  3. Step 3: Cross multiply
    721,247.80x = 995,309.66 × 398,957.64
  4. Step 4: Simplify right side
    721,247.80x = 397,086,393,022.80
  5. Step 5: Solve for x
    x = 397,086,393,022.80/721,247.80
  6. Step 6: Final answer
    x = 550,554.74

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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.