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Finding the Fourth Proportional to 492.16, 742.40 and 486.40

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Solution

The fourth proportional to 492.16, 742.40 and 486.40 is: 733.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    492.16 : 742.40 = 486.40 : x
  2. Step 2: Convert to fraction form
    492.16/742.40 = 486.40/x
  3. Step 3: Cross multiply
    492.16x = 742.40 × 486.40
  4. Step 4: Simplify right side
    492.16x = 361,103.36
  5. Step 5: Solve for x
    x = 361,103.36/492.16
  6. Step 6: Final answer
    x = 733.71

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.