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Finding the Fourth Proportional to 103.50, 154.56 and 83.28

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Solution

The fourth proportional to 103.50, 154.56 and 83.28 is: 124.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.50 : 154.56 = 83.28 : x
  2. Step 2: Convert to fraction form
    103.50/154.56 = 83.28/x
  3. Step 3: Cross multiply
    103.50x = 154.56 × 83.28
  4. Step 4: Simplify right side
    103.50x = 12,871.76
  5. Step 5: Solve for x
    x = 12,871.76/103.50
  6. Step 6: Final answer
    x = 124.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.