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Finding the Fourth Proportional to 142.74, 214.88 and 121.86

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Solution

The fourth proportional to 142.74, 214.88 and 121.86 is: 183.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.74 : 214.88 = 121.86 : x
  2. Step 2: Convert to fraction form
    142.74/214.88 = 121.86/x
  3. Step 3: Cross multiply
    142.74x = 214.88 × 121.86
  4. Step 4: Simplify right side
    142.74x = 26,184.67
  5. Step 5: Solve for x
    x = 26,184.67/142.74
  6. Step 6: Final answer
    x = 183.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.