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Finding the Fourth Proportional to 145.02, 217.38 and 80.76

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Solution

The fourth proportional to 145.02, 217.38 and 80.76 is: 121.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.02 : 217.38 = 80.76 : x
  2. Step 2: Convert to fraction form
    145.02/217.38 = 80.76/x
  3. Step 3: Cross multiply
    145.02x = 217.38 × 80.76
  4. Step 4: Simplify right side
    145.02x = 17,555.61
  5. Step 5: Solve for x
    x = 17,555.61/145.02
  6. Step 6: Final answer
    x = 121.06

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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.