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Finding the Fourth Proportional to 142.40, 196.08 and 121.52

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Solution

The fourth proportional to 142.40, 196.08 and 121.52 is: 167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.40 : 196.08 = 121.52 : x
  2. Step 2: Convert to fraction form
    142.40/196.08 = 121.52/x
  3. Step 3: Cross multiply
    142.40x = 196.08 × 121.52
  4. Step 4: Simplify right side
    142.40x = 23,827.64
  5. Step 5: Solve for x
    x = 23,827.64/142.40
  6. Step 6: Final answer
    x = 167.33

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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.