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Finding the Fourth Proportional to 148.47, 222.66 and 57.20

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Solution

The fourth proportional to 148.47, 222.66 and 57.20 is: 85.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.47 : 222.66 = 57.20 : x
  2. Step 2: Convert to fraction form
    148.47/222.66 = 57.20/x
  3. Step 3: Cross multiply
    148.47x = 222.66 × 57.20
  4. Step 4: Simplify right side
    148.47x = 12,735.81
  5. Step 5: Solve for x
    x = 12,735.81/148.47
  6. Step 6: Final answer
    x = 85.78

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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.