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Finding the Fourth Proportional to 92.88, 139.14 and 89.54

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Solution

The fourth proportional to 92.88, 139.14 and 89.54 is: 134.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.88 : 139.14 = 89.54 : x
  2. Step 2: Convert to fraction form
    92.88/139.14 = 89.54/x
  3. Step 3: Cross multiply
    92.88x = 139.14 × 89.54
  4. Step 4: Simplify right side
    92.88x = 12,458.60
  5. Step 5: Solve for x
    x = 12,458.60/92.88
  6. Step 6: Final answer
    x = 134.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.