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Finding the Fourth Proportional to 107.74, 148.74 and 89.38

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Solution

The fourth proportional to 107.74, 148.74 and 89.38 is: 123.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.74 : 148.74 = 89.38 : x
  2. Step 2: Convert to fraction form
    107.74/148.74 = 89.38/x
  3. Step 3: Cross multiply
    107.74x = 148.74 × 89.38
  4. Step 4: Simplify right side
    107.74x = 13,294.38
  5. Step 5: Solve for x
    x = 13,294.38/107.74
  6. Step 6: Final answer
    x = 123.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.