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Finding the Fourth Proportional to 147.75, 220.65 and 139.86

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Solution

The fourth proportional to 147.75, 220.65 and 139.86 is: 208.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.75 : 220.65 = 139.86 : x
  2. Step 2: Convert to fraction form
    147.75/220.65 = 139.86/x
  3. Step 3: Cross multiply
    147.75x = 220.65 × 139.86
  4. Step 4: Simplify right side
    147.75x = 30,860.11
  5. Step 5: Solve for x
    x = 30,860.11/147.75
  6. Step 6: Final answer
    x = 208.87

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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.