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Finding the Fourth Proportional to 107.51, 148.40 and 74.84

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Solution

The fourth proportional to 107.51, 148.40 and 74.84 is: 103.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.51 : 148.40 = 74.84 : x
  2. Step 2: Convert to fraction form
    107.51/148.40 = 74.84/x
  3. Step 3: Cross multiply
    107.51x = 148.40 × 74.84
  4. Step 4: Simplify right side
    107.51x = 11,105.14
  5. Step 5: Solve for x
    x = 11,105.14/107.51
  6. Step 6: Final answer
    x = 103.30

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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.