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Finding the Fourth Proportional to 2,647.92, 3,972.60 and 916.68

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Solution

The fourth proportional to 2,647.92, 3,972.60 and 916.68 is: 1,375.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,647.92 : 3,972.60 = 916.68 : x
  2. Step 2: Convert to fraction form
    2,647.92/3,972.60 = 916.68/x
  3. Step 3: Cross multiply
    2,647.92x = 3,972.60 × 916.68
  4. Step 4: Simplify right side
    2,647.92x = 3,641,602.97
  5. Step 5: Solve for x
    x = 3,641,602.97/2,647.92
  6. Step 6: Final answer
    x = 1,375.27

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1.5x scale

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.