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Finding the Fourth Proportional to 721.39, 992.37 and 632.47

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Solution

The fourth proportional to 721.39, 992.37 and 632.47 is: 870.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.39 : 992.37 = 632.47 : x
  2. Step 2: Convert to fraction form
    721.39/992.37 = 632.47/x
  3. Step 3: Cross multiply
    721.39x = 992.37 × 632.47
  4. Step 4: Simplify right side
    721.39x = 627,644.25
  5. Step 5: Solve for x
    x = 627,644.25/721.39
  6. Step 6: Final answer
    x = 870.05

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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.