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Finding the Fourth Proportional to 292, 402.78 and 193.72

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Solution

The fourth proportional to 292, 402.78 and 193.72 is: 267.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    292 : 402.78 = 193.72 : x
  2. Step 2: Convert to fraction form
    292/402.78 = 193.72/x
  3. Step 3: Cross multiply
    292x = 402.78 × 193.72
  4. Step 4: Simplify right side
    292x = 78,026.54
  5. Step 5: Solve for x
    x = 78,026.54/292
  6. Step 6: Final answer
    x = 267.21

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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.