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Finding the Fourth Proportional to 145.28, 200.72 and 121.97

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Solution

The fourth proportional to 145.28, 200.72 and 121.97 is: 168.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.28 : 200.72 = 121.97 : x
  2. Step 2: Convert to fraction form
    145.28/200.72 = 121.97/x
  3. Step 3: Cross multiply
    145.28x = 200.72 × 121.97
  4. Step 4: Simplify right side
    145.28x = 24,482.63
  5. Step 5: Solve for x
    x = 24,482.63/145.28
  6. Step 6: Final answer
    x = 168.52

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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.