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Finding the Fourth Proportional to 5,115.90, 7,059.42 and 2,877.42

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Solution

The fourth proportional to 5,115.90, 7,059.42 and 2,877.42 is: 3,970.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,115.90 : 7,059.42 = 2,877.42 : x
  2. Step 2: Convert to fraction form
    5,115.90/7,059.42 = 2,877.42/x
  3. Step 3: Cross multiply
    5,115.90x = 7,059.42 × 2,877.42
  4. Step 4: Simplify right side
    5,115.90x = 20,312,916.30
  5. Step 5: Solve for x
    x = 20,312,916.30/5,115.90
  6. Step 6: Final answer
    x = 3,970.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.