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Finding the Fourth Proportional to 725.06, 1,087.55 and 313.91

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Solution

The fourth proportional to 725.06, 1,087.55 and 313.91 is: 470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.06 : 1,087.55 = 313.91 : x
  2. Step 2: Convert to fraction form
    725.06/1,087.55 = 313.91/x
  3. Step 3: Cross multiply
    725.06x = 1,087.55 × 313.91
  4. Step 4: Simplify right side
    725.06x = 341,391.25
  5. Step 5: Solve for x
    x = 341,391.25/725.06
  6. Step 6: Final answer
    x = 470.85

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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.