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Finding the Fourth Proportional to 158.45, 237.45 and 128.03

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Solution

The fourth proportional to 158.45, 237.45 and 128.03 is: 191.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.45 : 237.45 = 128.03 : x
  2. Step 2: Convert to fraction form
    158.45/237.45 = 128.03/x
  3. Step 3: Cross multiply
    158.45x = 237.45 × 128.03
  4. Step 4: Simplify right side
    158.45x = 30,400.72
  5. Step 5: Solve for x
    x = 30,400.72/158.45
  6. Step 6: Final answer
    x = 191.86

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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.