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Finding the Fourth Proportional to 723.53, 1,085.45 and 261.65

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Solution

The fourth proportional to 723.53, 1,085.45 and 261.65 is: 392.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.53 : 1,085.45 = 261.65 : x
  2. Step 2: Convert to fraction form
    723.53/1,085.45 = 261.65/x
  3. Step 3: Cross multiply
    723.53x = 1,085.45 × 261.65
  4. Step 4: Simplify right side
    723.53x = 284,001.26
  5. Step 5: Solve for x
    x = 284,001.26/723.53
  6. Step 6: Final answer
    x = 392.52

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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.