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Finding the Fourth Proportional to 88.51, 121.80 and 80.74

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Solution

The fourth proportional to 88.51, 121.80 and 80.74 is: 111.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.51 : 121.80 = 80.74 : x
  2. Step 2: Convert to fraction form
    88.51/121.80 = 80.74/x
  3. Step 3: Cross multiply
    88.51x = 121.80 × 80.74
  4. Step 4: Simplify right side
    88.51x = 9,834.13
  5. Step 5: Solve for x
    x = 9,834.13/88.51
  6. Step 6: Final answer
    x = 111.11

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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.