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Finding the Fourth Proportional to 721.11, 995.61 and 555.03

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Solution

The fourth proportional to 721.11, 995.61 and 555.03 is: 766.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.11 : 995.61 = 555.03 : x
  2. Step 2: Convert to fraction form
    721.11/995.61 = 555.03/x
  3. Step 3: Cross multiply
    721.11x = 995.61 × 555.03
  4. Step 4: Simplify right side
    721.11x = 552,593.42
  5. Step 5: Solve for x
    x = 552,593.42/721.11
  6. Step 6: Final answer
    x = 766.31

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Double scale
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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.