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Finding the Fourth Proportional to 725.15, 1,087.66 and 286.34

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Solution

The fourth proportional to 725.15, 1,087.66 and 286.34 is: 429.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.15 : 1,087.66 = 286.34 : x
  2. Step 2: Convert to fraction form
    725.15/1,087.66 = 286.34/x
  3. Step 3: Cross multiply
    725.15x = 1,087.66 × 286.34
  4. Step 4: Simplify right side
    725.15x = 311,435.48
  5. Step 5: Solve for x
    x = 311,435.48/725.15
  6. Step 6: Final answer
    x = 429.48

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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.