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Finding the Fourth Proportional to 147.40, 221.09 and 39.19

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Solution

The fourth proportional to 147.40, 221.09 and 39.19 is: 58.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.40 : 221.09 = 39.19 : x
  2. Step 2: Convert to fraction form
    147.40/221.09 = 39.19/x
  3. Step 3: Cross multiply
    147.40x = 221.09 × 39.19
  4. Step 4: Simplify right side
    147.40x = 8,664.15
  5. Step 5: Solve for x
    x = 8,664.15/147.40
  6. Step 6: Final answer
    x = 58.78

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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.