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Finding the Fourth Proportional to 105.57, 157.49 and 104.20

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Solution

The fourth proportional to 105.57, 157.49 and 104.20 is: 155.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.57 : 157.49 = 104.20 : x
  2. Step 2: Convert to fraction form
    105.57/157.49 = 104.20/x
  3. Step 3: Cross multiply
    105.57x = 157.49 × 104.20
  4. Step 4: Simplify right side
    105.57x = 16,409.94
  5. Step 5: Solve for x
    x = 16,409.94/105.57
  6. Step 6: Final answer
    x = 155.45

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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.