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Finding the Fourth Proportional to 728.53, 1,005.06 and 492.75

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Solution

The fourth proportional to 728.53, 1,005.06 and 492.75 is: 679.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.53 : 1,005.06 = 492.75 : x
  2. Step 2: Convert to fraction form
    728.53/1,005.06 = 492.75/x
  3. Step 3: Cross multiply
    728.53x = 1,005.06 × 492.75
  4. Step 4: Simplify right side
    728.53x = 495,245.16
  5. Step 5: Solve for x
    x = 495,245.16/728.53
  6. Step 6: Final answer
    x = 679.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.