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Finding the Fourth Proportional to 106.40, 146.74 and 71.42

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Solution

The fourth proportional to 106.40, 146.74 and 71.42 is: 98.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.40 : 146.74 = 71.42 : x
  2. Step 2: Convert to fraction form
    106.40/146.74 = 71.42/x
  3. Step 3: Cross multiply
    106.40x = 146.74 × 71.42
  4. Step 4: Simplify right side
    106.40x = 10,479.26
  5. Step 5: Solve for x
    x = 10,479.26/106.40
  6. Step 6: Final answer
    x = 98.49

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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.