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Finding the Fourth Proportional to 158.37, 237.39 and 86.28

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Solution

The fourth proportional to 158.37, 237.39 and 86.28 is: 129.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.37 : 237.39 = 86.28 : x
  2. Step 2: Convert to fraction form
    158.37/237.39 = 86.28/x
  3. Step 3: Cross multiply
    158.37x = 237.39 × 86.28
  4. Step 4: Simplify right side
    158.37x = 20,482.01
  5. Step 5: Solve for x
    x = 20,482.01/158.37
  6. Step 6: Final answer
    x = 129.33

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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.