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Finding the Fourth Proportional to 145.18, 200.12 and 121.94

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Solution

The fourth proportional to 145.18, 200.12 and 121.94 is: 168.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.18 : 200.12 = 121.94 : x
  2. Step 2: Convert to fraction form
    145.18/200.12 = 121.94/x
  3. Step 3: Cross multiply
    145.18x = 200.12 × 121.94
  4. Step 4: Simplify right side
    145.18x = 24,402.46
  5. Step 5: Solve for x
    x = 24,402.46/145.18
  6. Step 6: Final answer
    x = 168.09

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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.