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Finding the Fourth Proportional to 357.72, 492.42 and 316.38

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Solution

The fourth proportional to 357.72, 492.42 and 316.38 is: 435.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.72 : 492.42 = 316.38 : x
  2. Step 2: Convert to fraction form
    357.72/492.42 = 316.38/x
  3. Step 3: Cross multiply
    357.72x = 492.42 × 316.38
  4. Step 4: Simplify right side
    357.72x = 155,791.84
  5. Step 5: Solve for x
    x = 155,791.84/357.72
  6. Step 6: Final answer
    x = 435.51

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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.