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Finding the Fourth Proportional to 143.47, 197.76 and 113.91

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Solution

The fourth proportional to 143.47, 197.76 and 113.91 is: 157.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.47 : 197.76 = 113.91 : x
  2. Step 2: Convert to fraction form
    143.47/197.76 = 113.91/x
  3. Step 3: Cross multiply
    143.47x = 197.76 × 113.91
  4. Step 4: Simplify right side
    143.47x = 22,525.89
  5. Step 5: Solve for x
    x = 22,525.89/143.47
  6. Step 6: Final answer
    x = 157.01

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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.