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Finding the Fourth Proportional to 148.78, 223.20 and 57.49

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Solution

The fourth proportional to 148.78, 223.20 and 57.49 is: 86.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.78 : 223.20 = 57.49 : x
  2. Step 2: Convert to fraction form
    148.78/223.20 = 57.49/x
  3. Step 3: Cross multiply
    148.78x = 223.20 × 57.49
  4. Step 4: Simplify right side
    148.78x = 12,831.77
  5. Step 5: Solve for x
    x = 12,831.77/148.78
  6. Step 6: Final answer
    x = 86.25

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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.