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Finding the Fourth Proportional to 103.91, 143.40 and 57.29

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Solution

The fourth proportional to 103.91, 143.40 and 57.29 is: 79.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 143.40 = 57.29 : x
  2. Step 2: Convert to fraction form
    103.91/143.40 = 57.29/x
  3. Step 3: Cross multiply
    103.91x = 143.40 × 57.29
  4. Step 4: Simplify right side
    103.91x = 8,215.39
  5. Step 5: Solve for x
    x = 8,215.39/103.91
  6. Step 6: Final answer
    x = 79.06

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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.