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Finding the Fourth Proportional to 124.78, 187.19 and 47.81

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Solution

The fourth proportional to 124.78, 187.19 and 47.81 is: 71.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.78 : 187.19 = 47.81 : x
  2. Step 2: Convert to fraction form
    124.78/187.19 = 47.81/x
  3. Step 3: Cross multiply
    124.78x = 187.19 × 47.81
  4. Step 4: Simplify right side
    124.78x = 8,950.00
  5. Step 5: Solve for x
    x = 8,950.00/124.78
  6. Step 6: Final answer
    x = 71.72

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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.