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Finding the Fourth Proportional to 145.71, 201.08 and 80.21

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Solution

The fourth proportional to 145.71, 201.08 and 80.21 is: 110.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.71 : 201.08 = 80.21 : x
  2. Step 2: Convert to fraction form
    145.71/201.08 = 80.21/x
  3. Step 3: Cross multiply
    145.71x = 201.08 × 80.21
  4. Step 4: Simplify right side
    145.71x = 16,128.62
  5. Step 5: Solve for x
    x = 16,128.62/145.71
  6. Step 6: Final answer
    x = 110.69

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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.