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Finding the Fourth Proportional to 88.41, 121.26 and 85.77

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Solution

The fourth proportional to 88.41, 121.26 and 85.77 is: 117.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.41 : 121.26 = 85.77 : x
  2. Step 2: Convert to fraction form
    88.41/121.26 = 85.77/x
  3. Step 3: Cross multiply
    88.41x = 121.26 × 85.77
  4. Step 4: Simplify right side
    88.41x = 10,400.47
  5. Step 5: Solve for x
    x = 10,400.47/88.41
  6. Step 6: Final answer
    x = 117.64

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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.