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Finding the Fourth Proportional to 148.24, 221.25 and 128.63

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Solution

The fourth proportional to 148.24, 221.25 and 128.63 is: 191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.24 : 221.25 = 128.63 : x
  2. Step 2: Convert to fraction form
    148.24/221.25 = 128.63/x
  3. Step 3: Cross multiply
    148.24x = 221.25 × 128.63
  4. Step 4: Simplify right side
    148.24x = 28,457.64
  5. Step 5: Solve for x
    x = 28,457.64/148.24
  6. Step 6: Final answer
    x = 191.98

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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.