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Finding the Fourth Proportional to 211.53, 291.99 and 124.28

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Solution

The fourth proportional to 211.53, 291.99 and 124.28 is: 171.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.53 : 291.99 = 124.28 : x
  2. Step 2: Convert to fraction form
    211.53/291.99 = 124.28/x
  3. Step 3: Cross multiply
    211.53x = 291.99 × 124.28
  4. Step 4: Simplify right side
    211.53x = 36,287.06
  5. Step 5: Solve for x
    x = 36,287.06/211.53
  6. Step 6: Final answer
    x = 171.55

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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.