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Finding the Fourth Proportional to 148.80, 224.40 and 139.80

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Solution

The fourth proportional to 148.80, 224.40 and 139.80 is: 210.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.80 : 224.40 = 139.80 : x
  2. Step 2: Convert to fraction form
    148.80/224.40 = 139.80/x
  3. Step 3: Cross multiply
    148.80x = 224.40 × 139.80
  4. Step 4: Simplify right side
    148.80x = 31,371.12
  5. Step 5: Solve for x
    x = 31,371.12/148.80
  6. Step 6: Final answer
    x = 210.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.