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Finding the Fourth Proportional to 120.86, 181.31 and 60.02

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Solution

The fourth proportional to 120.86, 181.31 and 60.02 is: 90.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.86 : 181.31 = 60.02 : x
  2. Step 2: Convert to fraction form
    120.86/181.31 = 60.02/x
  3. Step 3: Cross multiply
    120.86x = 181.31 × 60.02
  4. Step 4: Simplify right side
    120.86x = 10,881.02
  5. Step 5: Solve for x
    x = 10,881.02/120.86
  6. Step 6: Final answer
    x = 90.03

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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.