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Finding the Fourth Proportional to 158.85, 219.38 and 131.42

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Solution

The fourth proportional to 158.85, 219.38 and 131.42 is: 181.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.85 : 219.38 = 131.42 : x
  2. Step 2: Convert to fraction form
    158.85/219.38 = 131.42/x
  3. Step 3: Cross multiply
    158.85x = 219.38 × 131.42
  4. Step 4: Simplify right side
    158.85x = 28,830.81
  5. Step 5: Solve for x
    x = 28,830.81/158.85
  6. Step 6: Final answer
    x = 181.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.