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Finding the Fourth Proportional to 88.61, 121.40 and 85.37

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Solution

The fourth proportional to 88.61, 121.40 and 85.37 is: 116.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.61 : 121.40 = 85.37 : x
  2. Step 2: Convert to fraction form
    88.61/121.40 = 85.37/x
  3. Step 3: Cross multiply
    88.61x = 121.40 × 85.37
  4. Step 4: Simplify right side
    88.61x = 10,363.92
  5. Step 5: Solve for x
    x = 10,363.92/88.61
  6. Step 6: Final answer
    x = 116.96

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.