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Finding the Fourth Proportional to 89.89, 134.90 and 49.39

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Solution

The fourth proportional to 89.89, 134.90 and 49.39 is: 74.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.89 : 134.90 = 49.39 : x
  2. Step 2: Convert to fraction form
    89.89/134.90 = 49.39/x
  3. Step 3: Cross multiply
    89.89x = 134.90 × 49.39
  4. Step 4: Simplify right side
    89.89x = 6,662.71
  5. Step 5: Solve for x
    x = 6,662.71/89.89
  6. Step 6: Final answer
    x = 74.12

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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.