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Finding the Fourth Proportional to 145.75, 201.18 and 138.40

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Solution

The fourth proportional to 145.75, 201.18 and 138.40 is: 191.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.75 : 201.18 = 138.40 : x
  2. Step 2: Convert to fraction form
    145.75/201.18 = 138.40/x
  3. Step 3: Cross multiply
    145.75x = 201.18 × 138.40
  4. Step 4: Simplify right side
    145.75x = 27,843.31
  5. Step 5: Solve for x
    x = 27,843.31/145.75
  6. Step 6: Final answer
    x = 191.03

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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.