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Finding the Fourth Proportional to 721.47, 995.61 and 406.76

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Solution

The fourth proportional to 721.47, 995.61 and 406.76 is: 561.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.47 : 995.61 = 406.76 : x
  2. Step 2: Convert to fraction form
    721.47/995.61 = 406.76/x
  3. Step 3: Cross multiply
    721.47x = 995.61 × 406.76
  4. Step 4: Simplify right side
    721.47x = 404,969.35
  5. Step 5: Solve for x
    x = 404,969.35/721.47
  6. Step 6: Final answer
    x = 561.32

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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.