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Finding the Fourth Proportional to 70.90, 106.19 and 49.18

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Solution

The fourth proportional to 70.90, 106.19 and 49.18 is: 73.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.90 : 106.19 = 49.18 : x
  2. Step 2: Convert to fraction form
    70.90/106.19 = 49.18/x
  3. Step 3: Cross multiply
    70.90x = 106.19 × 49.18
  4. Step 4: Simplify right side
    70.90x = 5,222.42
  5. Step 5: Solve for x
    x = 5,222.42/70.90
  6. Step 6: Final answer
    x = 73.66

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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.