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Finding the Fourth Proportional to 103.74, 154.93 and 89.22

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Solution

The fourth proportional to 103.74, 154.93 and 89.22 is: 133.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.74 : 154.93 = 89.22 : x
  2. Step 2: Convert to fraction form
    103.74/154.93 = 89.22/x
  3. Step 3: Cross multiply
    103.74x = 154.93 × 89.22
  4. Step 4: Simplify right side
    103.74x = 13,822.85
  5. Step 5: Solve for x
    x = 13,822.85/103.74
  6. Step 6: Final answer
    x = 133.25

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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.