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Finding the Fourth Proportional to 70.62, 105.72 and 48.90

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Solution

The fourth proportional to 70.62, 105.72 and 48.90 is: 73.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.62 : 105.72 = 48.90 : x
  2. Step 2: Convert to fraction form
    70.62/105.72 = 48.90/x
  3. Step 3: Cross multiply
    70.62x = 105.72 × 48.90
  4. Step 4: Simplify right side
    70.62x = 5,169.71
  5. Step 5: Solve for x
    x = 5,169.71/70.62
  6. Step 6: Final answer
    x = 73.21

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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.