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Finding the Fourth Proportional to 2,381.20, 3,571.76 and 649.80

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Solution

The fourth proportional to 2,381.20, 3,571.76 and 649.80 is: 974.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,381.20 : 3,571.76 = 649.80 : x
  2. Step 2: Convert to fraction form
    2,381.20/3,571.76 = 649.80/x
  3. Step 3: Cross multiply
    2,381.20x = 3,571.76 × 649.80
  4. Step 4: Simplify right side
    2,381.20x = 2,320,929.65
  5. Step 5: Solve for x
    x = 2,320,929.65/2,381.20
  6. Step 6: Final answer
    x = 974.69

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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.