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Finding the Fourth Proportional to 145.78, 201.17 and 80.28

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Solution

The fourth proportional to 145.78, 201.17 and 80.28 is: 110.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.78 : 201.17 = 80.28 : x
  2. Step 2: Convert to fraction form
    145.78/201.17 = 80.28/x
  3. Step 3: Cross multiply
    145.78x = 201.17 × 80.28
  4. Step 4: Simplify right side
    145.78x = 16,149.93
  5. Step 5: Solve for x
    x = 16,149.93/145.78
  6. Step 6: Final answer
    x = 110.78

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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.