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Finding the Fourth Proportional to 725.05, 1,087.43 and 263.05

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Solution

The fourth proportional to 725.05, 1,087.43 and 263.05 is: 394.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.05 : 1,087.43 = 263.05 : x
  2. Step 2: Convert to fraction form
    725.05/1,087.43 = 263.05/x
  3. Step 3: Cross multiply
    725.05x = 1,087.43 × 263.05
  4. Step 4: Simplify right side
    725.05x = 286,044.43
  5. Step 5: Solve for x
    x = 286,044.43/725.05
  6. Step 6: Final answer
    x = 394.52

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.