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Finding the Fourth Proportional to 88.30, 131.36 and 85.96

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Solution

The fourth proportional to 88.30, 131.36 and 85.96 is: 127.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.30 : 131.36 = 85.96 : x
  2. Step 2: Convert to fraction form
    88.30/131.36 = 85.96/x
  3. Step 3: Cross multiply
    88.30x = 131.36 × 85.96
  4. Step 4: Simplify right side
    88.30x = 11,291.28
  5. Step 5: Solve for x
    x = 11,291.28/88.30
  6. Step 6: Final answer
    x = 127.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.