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Finding the Fourth Proportional to 1,254.67, 1,879.17 and 638.80

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Solution

The fourth proportional to 1,254.67, 1,879.17 and 638.80 is: 956.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254.67 : 1,879.17 = 638.80 : x
  2. Step 2: Convert to fraction form
    1,254.67/1,879.17 = 638.80/x
  3. Step 3: Cross multiply
    1,254.67x = 1,879.17 × 638.80
  4. Step 4: Simplify right side
    1,254.67x = 1,200,413.80
  5. Step 5: Solve for x
    x = 1,200,413.80/1,254.67
  6. Step 6: Final answer
    x = 956.76

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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.