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Finding the Fourth Proportional to 159.84, 238.60 and 142.68

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Solution

The fourth proportional to 159.84, 238.60 and 142.68 is: 212.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.84 : 238.60 = 142.68 : x
  2. Step 2: Convert to fraction form
    159.84/238.60 = 142.68/x
  3. Step 3: Cross multiply
    159.84x = 238.60 × 142.68
  4. Step 4: Simplify right side
    159.84x = 34,043.45
  5. Step 5: Solve for x
    x = 34,043.45/159.84
  6. Step 6: Final answer
    x = 212.98

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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.