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Finding the Fourth Proportional to 70.98, 106.45 and 49.31

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Solution

The fourth proportional to 70.98, 106.45 and 49.31 is: 73.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.98 : 106.45 = 49.31 : x
  2. Step 2: Convert to fraction form
    70.98/106.45 = 49.31/x
  3. Step 3: Cross multiply
    70.98x = 106.45 × 49.31
  4. Step 4: Simplify right side
    70.98x = 5,248.27
  5. Step 5: Solve for x
    x = 5,248.27/70.98
  6. Step 6: Final answer
    x = 73.95

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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.