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Finding the Fourth Proportional to 105.76, 158.40 and 69.64

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Solution

The fourth proportional to 105.76, 158.40 and 69.64 is: 104.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.76 : 158.40 = 69.64 : x
  2. Step 2: Convert to fraction form
    105.76/158.40 = 69.64/x
  3. Step 3: Cross multiply
    105.76x = 158.40 × 69.64
  4. Step 4: Simplify right side
    105.76x = 11,030.98
  5. Step 5: Solve for x
    x = 11,030.98/105.76
  6. Step 6: Final answer
    x = 104.30

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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.