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Finding the Fourth Proportional to 88.42, 121.91 and 60.74

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Solution

The fourth proportional to 88.42, 121.91 and 60.74 is: 83.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.42 : 121.91 = 60.74 : x
  2. Step 2: Convert to fraction form
    88.42/121.91 = 60.74/x
  3. Step 3: Cross multiply
    88.42x = 121.91 × 60.74
  4. Step 4: Simplify right side
    88.42x = 7,404.36
  5. Step 5: Solve for x
    x = 7,404.36/88.42
  6. Step 6: Final answer
    x = 83.74

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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.