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Finding the Fourth Proportional to 103.77, 155.66 and 69.56

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Solution

The fourth proportional to 103.77, 155.66 and 69.56 is: 104.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.77 : 155.66 = 69.56 : x
  2. Step 2: Convert to fraction form
    103.77/155.66 = 69.56/x
  3. Step 3: Cross multiply
    103.77x = 155.66 × 69.56
  4. Step 4: Simplify right side
    103.77x = 10,827.71
  5. Step 5: Solve for x
    x = 10,827.71/103.77
  6. Step 6: Final answer
    x = 104.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.