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Finding the Fourth Proportional to 146.16, 217.76 and 139.95

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Solution

The fourth proportional to 146.16, 217.76 and 139.95 is: 208.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.16 : 217.76 = 139.95 : x
  2. Step 2: Convert to fraction form
    146.16/217.76 = 139.95/x
  3. Step 3: Cross multiply
    146.16x = 217.76 × 139.95
  4. Step 4: Simplify right side
    146.16x = 30,474.81
  5. Step 5: Solve for x
    x = 30,474.81/146.16
  6. Step 6: Final answer
    x = 208.50

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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.