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Finding the Fourth Proportional to 723.72, 1,085.58 and 434.52

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Solution

The fourth proportional to 723.72, 1,085.58 and 434.52 is: 651.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.72 : 1,085.58 = 434.52 : x
  2. Step 2: Convert to fraction form
    723.72/1,085.58 = 434.52/x
  3. Step 3: Cross multiply
    723.72x = 1,085.58 × 434.52
  4. Step 4: Simplify right side
    723.72x = 471,706.22
  5. Step 5: Solve for x
    x = 471,706.22/723.72
  6. Step 6: Final answer
    x = 651.78

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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.