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Finding the Fourth Proportional to 210.89, 291.03 and 123.56

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Solution

The fourth proportional to 210.89, 291.03 and 123.56 is: 170.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.89 : 291.03 = 123.56 : x
  2. Step 2: Convert to fraction form
    210.89/291.03 = 123.56/x
  3. Step 3: Cross multiply
    210.89x = 291.03 × 123.56
  4. Step 4: Simplify right side
    210.89x = 35,959.67
  5. Step 5: Solve for x
    x = 35,959.67/210.89
  6. Step 6: Final answer
    x = 170.51

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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.