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Finding the Fourth Proportional to 3,381.69, 5,072.55 and 916.53

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Solution

The fourth proportional to 3,381.69, 5,072.55 and 916.53 is: 1,374.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,381.69 : 5,072.55 = 916.53 : x
  2. Step 2: Convert to fraction form
    3,381.69/5,072.55 = 916.53/x
  3. Step 3: Cross multiply
    3,381.69x = 5,072.55 × 916.53
  4. Step 4: Simplify right side
    3,381.69x = 4,649,144.25
  5. Step 5: Solve for x
    x = 4,649,144.25/3,381.69
  6. Step 6: Final answer
    x = 1,374.80

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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.