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Finding the Fourth Proportional to 142.62, 196.80 and 86.58

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Solution

The fourth proportional to 142.62, 196.80 and 86.58 is: 119.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.62 : 196.80 = 86.58 : x
  2. Step 2: Convert to fraction form
    142.62/196.80 = 86.58/x
  3. Step 3: Cross multiply
    142.62x = 196.80 × 86.58
  4. Step 4: Simplify right side
    142.62x = 17,038.94
  5. Step 5: Solve for x
    x = 17,038.94/142.62
  6. Step 6: Final answer
    x = 119.47

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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.