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Finding the Fourth Proportional to 88.48, 133.40 and 85.12

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Solution

The fourth proportional to 88.48, 133.40 and 85.12 is: 128.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.48 : 133.40 = 85.12 : x
  2. Step 2: Convert to fraction form
    88.48/133.40 = 85.12/x
  3. Step 3: Cross multiply
    88.48x = 133.40 × 85.12
  4. Step 4: Simplify right side
    88.48x = 11,355.01
  5. Step 5: Solve for x
    x = 11,355.01/88.48
  6. Step 6: Final answer
    x = 128.33

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.