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Finding the Fourth Proportional to 121, 181.20 and 90.52

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Solution

The fourth proportional to 121, 181.20 and 90.52 is: 135.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121 : 181.20 = 90.52 : x
  2. Step 2: Convert to fraction form
    121/181.20 = 90.52/x
  3. Step 3: Cross multiply
    121x = 181.20 × 90.52
  4. Step 4: Simplify right side
    121x = 16,402.22
  5. Step 5: Solve for x
    x = 16,402.22/121
  6. Step 6: Final answer
    x = 135.56

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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.