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Finding the Fourth Proportional to 148.37, 221.30 and 139.46

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Solution

The fourth proportional to 148.37, 221.30 and 139.46 is: 208.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.37 : 221.30 = 139.46 : x
  2. Step 2: Convert to fraction form
    148.37/221.30 = 139.46/x
  3. Step 3: Cross multiply
    148.37x = 221.30 × 139.46
  4. Step 4: Simplify right side
    148.37x = 30,861.22
  5. Step 5: Solve for x
    x = 30,861.22/148.37
  6. Step 6: Final answer
    x = 208.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.