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Finding the Fourth Proportional to 113.90, 170.79 and 71.06

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Solution

The fourth proportional to 113.90, 170.79 and 71.06 is: 106.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 170.79 = 71.06 : x
  2. Step 2: Convert to fraction form
    113.90/170.79 = 71.06/x
  3. Step 3: Cross multiply
    113.90x = 170.79 × 71.06
  4. Step 4: Simplify right side
    113.90x = 12,136.34
  5. Step 5: Solve for x
    x = 12,136.34/113.90
  6. Step 6: Final answer
    x = 106.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.