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Finding the Fourth Proportional to 107.16, 148.08 and 103.92

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Solution

The fourth proportional to 107.16, 148.08 and 103.92 is: 143.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.16 : 148.08 = 103.92 : x
  2. Step 2: Convert to fraction form
    107.16/148.08 = 103.92/x
  3. Step 3: Cross multiply
    107.16x = 148.08 × 103.92
  4. Step 4: Simplify right side
    107.16x = 15,388.47
  5. Step 5: Solve for x
    x = 15,388.47/107.16
  6. Step 6: Final answer
    x = 143.60

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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.