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Finding the Fourth Proportional to 145.55, 200.90 and 138.20

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Solution

The fourth proportional to 145.55, 200.90 and 138.20 is: 190.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.55 : 200.90 = 138.20 : x
  2. Step 2: Convert to fraction form
    145.55/200.90 = 138.20/x
  3. Step 3: Cross multiply
    145.55x = 200.90 × 138.20
  4. Step 4: Simplify right side
    145.55x = 27,764.38
  5. Step 5: Solve for x
    x = 27,764.38/145.55
  6. Step 6: Final answer
    x = 190.75

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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.