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Finding the Fourth Proportional to 121.58, 182.01 and 90.71

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Solution

The fourth proportional to 121.58, 182.01 and 90.71 is: 135.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.58 : 182.01 = 90.71 : x
  2. Step 2: Convert to fraction form
    121.58/182.01 = 90.71/x
  3. Step 3: Cross multiply
    121.58x = 182.01 × 90.71
  4. Step 4: Simplify right side
    121.58x = 16,510.13
  5. Step 5: Solve for x
    x = 16,510.13/121.58
  6. Step 6: Final answer
    x = 135.80

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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.