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Finding the Fourth Proportional to 721.52, 993.52 and 648.62

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Solution

The fourth proportional to 721.52, 993.52 and 648.62 is: 893.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.52 : 993.52 = 648.62 : x
  2. Step 2: Convert to fraction form
    721.52/993.52 = 648.62/x
  3. Step 3: Cross multiply
    721.52x = 993.52 × 648.62
  4. Step 4: Simplify right side
    721.52x = 644,416.94
  5. Step 5: Solve for x
    x = 644,416.94/721.52
  6. Step 6: Final answer
    x = 893.14

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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.