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Finding the Fourth Proportional to 124.74, 187.18 and 105.72

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Solution

The fourth proportional to 124.74, 187.18 and 105.72 is: 158.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.74 : 187.18 = 105.72 : x
  2. Step 2: Convert to fraction form
    124.74/187.18 = 105.72/x
  3. Step 3: Cross multiply
    124.74x = 187.18 × 105.72
  4. Step 4: Simplify right side
    124.74x = 19,788.67
  5. Step 5: Solve for x
    x = 19,788.67/124.74
  6. Step 6: Final answer
    x = 158.64

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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.