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Finding the Fourth Proportional to 143.04, 197.36 and 87.77

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Solution

The fourth proportional to 143.04, 197.36 and 87.77 is: 121.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.04 : 197.36 = 87.77 : x
  2. Step 2: Convert to fraction form
    143.04/197.36 = 87.77/x
  3. Step 3: Cross multiply
    143.04x = 197.36 × 87.77
  4. Step 4: Simplify right side
    143.04x = 17,321.30
  5. Step 5: Solve for x
    x = 17,321.30/143.04
  6. Step 6: Final answer
    x = 121.09

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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.