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Finding the Fourth Proportional to 723.86, 1,085.90 and 236.79

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Solution

The fourth proportional to 723.86, 1,085.90 and 236.79 is: 355.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.86 : 1,085.90 = 236.79 : x
  2. Step 2: Convert to fraction form
    723.86/1,085.90 = 236.79/x
  3. Step 3: Cross multiply
    723.86x = 1,085.90 × 236.79
  4. Step 4: Simplify right side
    723.86x = 257,129.08
  5. Step 5: Solve for x
    x = 257,129.08/723.86
  6. Step 6: Final answer
    x = 355.22

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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.