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Finding the Fourth Proportional to 103.59, 154.63 and 91.44

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Solution

The fourth proportional to 103.59, 154.63 and 91.44 is: 136.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.59 : 154.63 = 91.44 : x
  2. Step 2: Convert to fraction form
    103.59/154.63 = 91.44/x
  3. Step 3: Cross multiply
    103.59x = 154.63 × 91.44
  4. Step 4: Simplify right side
    103.59x = 14,139.37
  5. Step 5: Solve for x
    x = 14,139.37/103.59
  6. Step 6: Final answer
    x = 136.49

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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.