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Finding the Fourth Proportional to 492.66, 738.76 and 287.28

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Solution

The fourth proportional to 492.66, 738.76 and 287.28 is: 430.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.66 : 738.76 = 287.28 : x
  2. Step 2: Convert to fraction form
    492.66/738.76 = 287.28/x
  3. Step 3: Cross multiply
    492.66x = 738.76 × 287.28
  4. Step 4: Simplify right side
    492.66x = 212,230.97
  5. Step 5: Solve for x
    x = 212,230.97/492.66
  6. Step 6: Final answer
    x = 430.79

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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.