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Finding the Fourth Proportional to 723.63, 1,085.36 and 203.61

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Solution

The fourth proportional to 723.63, 1,085.36 and 203.61 is: 305.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.63 : 1,085.36 = 203.61 : x
  2. Step 2: Convert to fraction form
    723.63/1,085.36 = 203.61/x
  3. Step 3: Cross multiply
    723.63x = 1,085.36 × 203.61
  4. Step 4: Simplify right side
    723.63x = 220,989.13
  5. Step 5: Solve for x
    x = 220,989.13/723.63
  6. Step 6: Final answer
    x = 305.39

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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.