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Finding the Fourth Proportional to 105.57, 158.20 and 64.87

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Solution

The fourth proportional to 105.57, 158.20 and 64.87 is: 97.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.57 : 158.20 = 64.87 : x
  2. Step 2: Convert to fraction form
    105.57/158.20 = 64.87/x
  3. Step 3: Cross multiply
    105.57x = 158.20 × 64.87
  4. Step 4: Simplify right side
    105.57x = 10,261.88
  5. Step 5: Solve for x
    x = 10,261.88/105.57
  6. Step 6: Final answer
    x = 97.20

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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.