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Finding the Fourth Proportional to 106.70, 147.20 and 71.70

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Solution

The fourth proportional to 106.70, 147.20 and 71.70 is: 98.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.70 : 147.20 = 71.70 : x
  2. Step 2: Convert to fraction form
    106.70/147.20 = 71.70/x
  3. Step 3: Cross multiply
    106.70x = 147.20 × 71.70
  4. Step 4: Simplify right side
    106.70x = 10,554.24
  5. Step 5: Solve for x
    x = 10,554.24/106.70
  6. Step 6: Final answer
    x = 98.92

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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.