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Finding the Fourth Proportional to 121.56, 167.58 and 87

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Solution

The fourth proportional to 121.56, 167.58 and 87 is: 119.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.56 : 167.58 = 87 : x
  2. Step 2: Convert to fraction form
    121.56/167.58 = 87/x
  3. Step 3: Cross multiply
    121.56x = 167.58 × 87
  4. Step 4: Simplify right side
    121.56x = 14,579.46
  5. Step 5: Solve for x
    x = 14,579.46/121.56
  6. Step 6: Final answer
    x = 119.94

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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.