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Finding the Fourth Proportional to 158.72, 219.12 and 142.16

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Solution

The fourth proportional to 158.72, 219.12 and 142.16 is: 196.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.72 : 219.12 = 142.16 : x
  2. Step 2: Convert to fraction form
    158.72/219.12 = 142.16/x
  3. Step 3: Cross multiply
    158.72x = 219.12 × 142.16
  4. Step 4: Simplify right side
    158.72x = 31,150.10
  5. Step 5: Solve for x
    x = 31,150.10/158.72
  6. Step 6: Final answer
    x = 196.26

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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.