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Finding the Fourth Proportional to 107.29, 148.35 and 74.80

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Solution

The fourth proportional to 107.29, 148.35 and 74.80 is: 103.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.29 : 148.35 = 74.80 : x
  2. Step 2: Convert to fraction form
    107.29/148.35 = 74.80/x
  3. Step 3: Cross multiply
    107.29x = 148.35 × 74.80
  4. Step 4: Simplify right side
    107.29x = 11,096.58
  5. Step 5: Solve for x
    x = 11,096.58/107.29
  6. Step 6: Final answer
    x = 103.43

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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.