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Finding the Fourth Proportional to 158.58, 237.81 and 85.38

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Solution

The fourth proportional to 158.58, 237.81 and 85.38 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.58 : 237.81 = 85.38 : x
  2. Step 2: Convert to fraction form
    158.58/237.81 = 85.38/x
  3. Step 3: Cross multiply
    158.58x = 237.81 × 85.38
  4. Step 4: Simplify right side
    158.58x = 20,304.22
  5. Step 5: Solve for x
    x = 20,304.22/158.58
  6. Step 6: Final answer
    x = 128.04

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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.