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Finding the Fourth Proportional to 121.70, 182.30 and 53.18

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Solution

The fourth proportional to 121.70, 182.30 and 53.18 is: 79.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.70 : 182.30 = 53.18 : x
  2. Step 2: Convert to fraction form
    121.70/182.30 = 53.18/x
  3. Step 3: Cross multiply
    121.70x = 182.30 × 53.18
  4. Step 4: Simplify right side
    121.70x = 9,694.71
  5. Step 5: Solve for x
    x = 9,694.71/121.70
  6. Step 6: Final answer
    x = 79.66

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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.