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Finding the Fourth Proportional to 2,379.68, 3,570.42 and 918.92

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Solution

The fourth proportional to 2,379.68, 3,570.42 and 918.92 is: 1,378.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,379.68 : 3,570.42 = 918.92 : x
  2. Step 2: Convert to fraction form
    2,379.68/3,570.42 = 918.92/x
  3. Step 3: Cross multiply
    2,379.68x = 3,570.42 × 918.92
  4. Step 4: Simplify right side
    2,379.68x = 3,280,930.35
  5. Step 5: Solve for x
    x = 3,280,930.35/2,379.68
  6. Step 6: Final answer
    x = 1,378.73

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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.