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Finding the Fourth Proportional to 211.78, 292.28 and 124.47

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Solution

The fourth proportional to 211.78, 292.28 and 124.47 is: 171.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.78 : 292.28 = 124.47 : x
  2. Step 2: Convert to fraction form
    211.78/292.28 = 124.47/x
  3. Step 3: Cross multiply
    211.78x = 292.28 × 124.47
  4. Step 4: Simplify right side
    211.78x = 36,379.47
  5. Step 5: Solve for x
    x = 36,379.47/211.78
  6. Step 6: Final answer
    x = 171.78

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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.