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Finding the Fourth Proportional to 3,515.72, 5,273.21 and 918.65

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Solution

The fourth proportional to 3,515.72, 5,273.21 and 918.65 is: 1,377.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,515.72 : 5,273.21 = 918.65 : x
  2. Step 2: Convert to fraction form
    3,515.72/5,273.21 = 918.65/x
  3. Step 3: Cross multiply
    3,515.72x = 5,273.21 × 918.65
  4. Step 4: Simplify right side
    3,515.72x = 4,844,203.41
  5. Step 5: Solve for x
    x = 4,844,203.41/3,515.72
  6. Step 6: Final answer
    x = 1,377.87

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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.