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Finding the Fourth Proportional to 2,610.72, 3,916.80 and 879.60

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Solution

The fourth proportional to 2,610.72, 3,916.80 and 879.60 is: 1,319.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,610.72 : 3,916.80 = 879.60 : x
  2. Step 2: Convert to fraction form
    2,610.72/3,916.80 = 879.60/x
  3. Step 3: Cross multiply
    2,610.72x = 3,916.80 × 879.60
  4. Step 4: Simplify right side
    2,610.72x = 3,445,217.28
  5. Step 5: Solve for x
    x = 3,445,217.28/2,610.72
  6. Step 6: Final answer
    x = 1,319.64

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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.