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Finding the Fourth Proportional to 148.66, 222.90 and 87.80

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Solution

The fourth proportional to 148.66, 222.90 and 87.80 is: 131.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.66 : 222.90 = 87.80 : x
  2. Step 2: Convert to fraction form
    148.66/222.90 = 87.80/x
  3. Step 3: Cross multiply
    148.66x = 222.90 × 87.80
  4. Step 4: Simplify right side
    148.66x = 19,570.62
  5. Step 5: Solve for x
    x = 19,570.62/148.66
  6. Step 6: Final answer
    x = 131.65

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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.