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Finding the Fourth Proportional to 721.10, 995.69 and 580.77

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Solution

The fourth proportional to 721.10, 995.69 and 580.77 is: 801.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.10 : 995.69 = 580.77 : x
  2. Step 2: Convert to fraction form
    721.10/995.69 = 580.77/x
  3. Step 3: Cross multiply
    721.10x = 995.69 × 580.77
  4. Step 4: Simplify right side
    721.10x = 578,268.33
  5. Step 5: Solve for x
    x = 578,268.33/721.10
  6. Step 6: Final answer
    x = 801.92

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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.