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Finding the Fourth Proportional to 88.78, 133.88 and 85.99

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Solution

The fourth proportional to 88.78, 133.88 and 85.99 is: 129.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.78 : 133.88 = 85.99 : x
  2. Step 2: Convert to fraction form
    88.78/133.88 = 85.99/x
  3. Step 3: Cross multiply
    88.78x = 133.88 × 85.99
  4. Step 4: Simplify right side
    88.78x = 11,512.34
  5. Step 5: Solve for x
    x = 11,512.34/88.78
  6. Step 6: Final answer
    x = 129.67

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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.