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Finding the Fourth Proportional to 158.05, 235.99 and 139.38

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Solution

The fourth proportional to 158.05, 235.99 and 139.38 is: 208.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.05 : 235.99 = 139.38 : x
  2. Step 2: Convert to fraction form
    158.05/235.99 = 139.38/x
  3. Step 3: Cross multiply
    158.05x = 235.99 × 139.38
  4. Step 4: Simplify right side
    158.05x = 32,892.29
  5. Step 5: Solve for x
    x = 32,892.29/158.05
  6. Step 6: Final answer
    x = 208.11

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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.