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Finding the Fourth Proportional to 103.98, 143.48 and 57.34

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Solution

The fourth proportional to 103.98, 143.48 and 57.34 is: 79.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.98 : 143.48 = 57.34 : x
  2. Step 2: Convert to fraction form
    103.98/143.48 = 57.34/x
  3. Step 3: Cross multiply
    103.98x = 143.48 × 57.34
  4. Step 4: Simplify right side
    103.98x = 8,227.14
  5. Step 5: Solve for x
    x = 8,227.14/103.98
  6. Step 6: Final answer
    x = 79.12

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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.