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Finding the Fourth Proportional to 88.10, 121.39 and 85.07

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Solution

The fourth proportional to 88.10, 121.39 and 85.07 is: 117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.10 : 121.39 = 85.07 : x
  2. Step 2: Convert to fraction form
    88.10/121.39 = 85.07/x
  3. Step 3: Cross multiply
    88.10x = 121.39 × 85.07
  4. Step 4: Simplify right side
    88.10x = 10,326.65
  5. Step 5: Solve for x
    x = 10,326.65/88.10
  6. Step 6: Final answer
    x = 117.22

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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.