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Finding the Fourth Proportional to 723.37, 1,085.19 and 431.38

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Solution

The fourth proportional to 723.37, 1,085.19 and 431.38 is: 647.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.37 : 1,085.19 = 431.38 : x
  2. Step 2: Convert to fraction form
    723.37/1,085.19 = 431.38/x
  3. Step 3: Cross multiply
    723.37x = 1,085.19 × 431.38
  4. Step 4: Simplify right side
    723.37x = 468,129.26
  5. Step 5: Solve for x
    x = 468,129.26/723.37
  6. Step 6: Final answer
    x = 647.15

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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.