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Finding the Fourth Proportional to 3,381.65, 5,072.79 and 916.49

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Solution

The fourth proportional to 3,381.65, 5,072.79 and 916.49 is: 1,374.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,381.65 : 5,072.79 = 916.49 : x
  2. Step 2: Convert to fraction form
    3,381.65/5,072.79 = 916.49/x
  3. Step 3: Cross multiply
    3,381.65x = 5,072.79 × 916.49
  4. Step 4: Simplify right side
    3,381.65x = 4,649,161.31
  5. Step 5: Solve for x
    x = 4,649,161.31/3,381.65
  6. Step 6: Final answer
    x = 1,374.82

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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.