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Finding the Fourth Proportional to 142.96, 214.33 and 74.45

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Solution

The fourth proportional to 142.96, 214.33 and 74.45 is: 111.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.96 : 214.33 = 74.45 : x
  2. Step 2: Convert to fraction form
    142.96/214.33 = 74.45/x
  3. Step 3: Cross multiply
    142.96x = 214.33 × 74.45
  4. Step 4: Simplify right side
    142.96x = 15,956.87
  5. Step 5: Solve for x
    x = 15,956.87/142.96
  6. Step 6: Final answer
    x = 111.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.