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Finding the Fourth Proportional to 721.10, 995.19 and 499.97

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Solution

The fourth proportional to 721.10, 995.19 and 499.97 is: 690.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.10 : 995.19 = 499.97 : x
  2. Step 2: Convert to fraction form
    721.10/995.19 = 499.97/x
  3. Step 3: Cross multiply
    721.10x = 995.19 × 499.97
  4. Step 4: Simplify right side
    721.10x = 497,565.76
  5. Step 5: Solve for x
    x = 497,565.76/721.10
  6. Step 6: Final answer
    x = 690.01

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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.