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Finding the Fourth Proportional to 721.48, 995.74 and 556.62

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Solution

The fourth proportional to 721.48, 995.74 and 556.62 is: 768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.48 : 995.74 = 556.62 : x
  2. Step 2: Convert to fraction form
    721.48/995.74 = 556.62/x
  3. Step 3: Cross multiply
    721.48x = 995.74 × 556.62
  4. Step 4: Simplify right side
    721.48x = 554,248.80
  5. Step 5: Solve for x
    x = 554,248.80/721.48
  6. Step 6: Final answer
    x = 768.21

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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.