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Finding the Fourth Proportional to 107.57, 148.39 and 72.55

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Solution

The fourth proportional to 107.57, 148.39 and 72.55 is: 100.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.57 : 148.39 = 72.55 : x
  2. Step 2: Convert to fraction form
    107.57/148.39 = 72.55/x
  3. Step 3: Cross multiply
    107.57x = 148.39 × 72.55
  4. Step 4: Simplify right side
    107.57x = 10,765.51
  5. Step 5: Solve for x
    x = 10,765.51/107.57
  6. Step 6: Final answer
    x = 100.08

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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.