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Finding the Fourth Proportional to 124.50, 186.46 and 105.20

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Solution

The fourth proportional to 124.50, 186.46 and 105.20 is: 157.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.50 : 186.46 = 105.20 : x
  2. Step 2: Convert to fraction form
    124.50/186.46 = 105.20/x
  3. Step 3: Cross multiply
    124.50x = 186.46 × 105.20
  4. Step 4: Simplify right side
    124.50x = 19,615.59
  5. Step 5: Solve for x
    x = 19,615.59/124.50
  6. Step 6: Final answer
    x = 157.55

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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.