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Finding the Fourth Proportional to 721.38, 995.51 and 459.39

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Solution

The fourth proportional to 721.38, 995.51 and 459.39 is: 633.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.38 : 995.51 = 459.39 : x
  2. Step 2: Convert to fraction form
    721.38/995.51 = 459.39/x
  3. Step 3: Cross multiply
    721.38x = 995.51 × 459.39
  4. Step 4: Simplify right side
    721.38x = 457,327.34
  5. Step 5: Solve for x
    x = 457,327.34/721.38
  6. Step 6: Final answer
    x = 633.96

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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.