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Finding the Fourth Proportional to 159.94, 240 and 139.87

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Solution

The fourth proportional to 159.94, 240 and 139.87 is: 209.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.94 : 240 = 139.87 : x
  2. Step 2: Convert to fraction form
    159.94/240 = 139.87/x
  3. Step 3: Cross multiply
    159.94x = 240 × 139.87
  4. Step 4: Simplify right side
    159.94x = 33,568.80
  5. Step 5: Solve for x
    x = 33,568.80/159.94
  6. Step 6: Final answer
    x = 209.88

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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.