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Finding the Fourth Proportional to 2,791.42, 4,186.07 and 916.87

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Solution

The fourth proportional to 2,791.42, 4,186.07 and 916.87 is: 1,374.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,791.42 : 4,186.07 = 916.87 : x
  2. Step 2: Convert to fraction form
    2,791.42/4,186.07 = 916.87/x
  3. Step 3: Cross multiply
    2,791.42x = 4,186.07 × 916.87
  4. Step 4: Simplify right side
    2,791.42x = 3,838,077.42
  5. Step 5: Solve for x
    x = 3,838,077.42/2,791.42
  6. Step 6: Final answer
    x = 1,374.96

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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.