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Finding the Fourth Proportional to 158.72, 219.20 and 145.76

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Solution

The fourth proportional to 158.72, 219.20 and 145.76 is: 201.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.72 : 219.20 = 145.76 : x
  2. Step 2: Convert to fraction form
    158.72/219.20 = 145.76/x
  3. Step 3: Cross multiply
    158.72x = 219.20 × 145.76
  4. Step 4: Simplify right side
    158.72x = 31,950.59
  5. Step 5: Solve for x
    x = 31,950.59/158.72
  6. Step 6: Final answer
    x = 201.30

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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.