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Finding the Fourth Proportional to 741.28, 1,022.62 and 492.72

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Solution

The fourth proportional to 741.28, 1,022.62 and 492.72 is: 679.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.28 : 1,022.62 = 492.72 : x
  2. Step 2: Convert to fraction form
    741.28/1,022.62 = 492.72/x
  3. Step 3: Cross multiply
    741.28x = 1,022.62 × 492.72
  4. Step 4: Simplify right side
    741.28x = 503,865.33
  5. Step 5: Solve for x
    x = 503,865.33/741.28
  6. Step 6: Final answer
    x = 679.72

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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.