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Finding the Fourth Proportional to 721.76, 995.20 and 525.36

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Solution

The fourth proportional to 721.76, 995.20 and 525.36 is: 724.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.76 : 995.20 = 525.36 : x
  2. Step 2: Convert to fraction form
    721.76/995.20 = 525.36/x
  3. Step 3: Cross multiply
    721.76x = 995.20 × 525.36
  4. Step 4: Simplify right side
    721.76x = 522,838.27
  5. Step 5: Solve for x
    x = 522,838.27/721.76
  6. Step 6: Final answer
    x = 724.39

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Double scale
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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.