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Finding the Fourth Proportional to 721.44, 994.55 and 555.39

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Solution

The fourth proportional to 721.44, 994.55 and 555.39 is: 765.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.44 : 994.55 = 555.39 : x
  2. Step 2: Convert to fraction form
    721.44/994.55 = 555.39/x
  3. Step 3: Cross multiply
    721.44x = 994.55 × 555.39
  4. Step 4: Simplify right side
    721.44x = 552,360.35
  5. Step 5: Solve for x
    x = 552,360.35/721.44
  6. Step 6: Final answer
    x = 765.64

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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.