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Finding the Fourth Proportional to 723.36, 1,085.15 and 261.25

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Solution

The fourth proportional to 723.36, 1,085.15 and 261.25 is: 391.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.36 : 1,085.15 = 261.25 : x
  2. Step 2: Convert to fraction form
    723.36/1,085.15 = 261.25/x
  3. Step 3: Cross multiply
    723.36x = 1,085.15 × 261.25
  4. Step 4: Simplify right side
    723.36x = 283,497.45
  5. Step 5: Solve for x
    x = 283,497.45/723.36
  6. Step 6: Final answer
    x = 391.92

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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.