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Finding the Fourth Proportional to 729.20, 1,005.26 and 492.74

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Solution

The fourth proportional to 729.20, 1,005.26 and 492.74 is: 679.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.20 : 1,005.26 = 492.74 : x
  2. Step 2: Convert to fraction form
    729.20/1,005.26 = 492.74/x
  3. Step 3: Cross multiply
    729.20x = 1,005.26 × 492.74
  4. Step 4: Simplify right side
    729.20x = 495,331.81
  5. Step 5: Solve for x
    x = 495,331.81/729.20
  6. Step 6: Final answer
    x = 679.28

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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.