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Finding the Fourth Proportional to 103.36, 154.28 and 91.36

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Solution

The fourth proportional to 103.36, 154.28 and 91.36 is: 136.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.36 : 154.28 = 91.36 : x
  2. Step 2: Convert to fraction form
    103.36/154.28 = 91.36/x
  3. Step 3: Cross multiply
    103.36x = 154.28 × 91.36
  4. Step 4: Simplify right side
    103.36x = 14,095.02
  5. Step 5: Solve for x
    x = 14,095.02/103.36
  6. Step 6: Final answer
    x = 136.37

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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.