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Finding the Fourth Proportional to 210.96, 291.11 and 123.66

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Solution

The fourth proportional to 210.96, 291.11 and 123.66 is: 170.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.96 : 291.11 = 123.66 : x
  2. Step 2: Convert to fraction form
    210.96/291.11 = 123.66/x
  3. Step 3: Cross multiply
    210.96x = 291.11 × 123.66
  4. Step 4: Simplify right side
    210.96x = 35,998.04
  5. Step 5: Solve for x
    x = 35,998.04/210.96
  6. Step 6: Final answer
    x = 170.64

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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.