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Finding the Fourth Proportional to 724.34, 1,085.91 and 358.63

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Solution

The fourth proportional to 724.34, 1,085.91 and 358.63 is: 537.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.34 : 1,085.91 = 358.63 : x
  2. Step 2: Convert to fraction form
    724.34/1,085.91 = 358.63/x
  3. Step 3: Cross multiply
    724.34x = 1,085.91 × 358.63
  4. Step 4: Simplify right side
    724.34x = 389,435.84
  5. Step 5: Solve for x
    x = 389,435.84/724.34
  6. Step 6: Final answer
    x = 537.64

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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.