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Finding the Fourth Proportional to 8,757.40, 13,137.90 and 2,918.20

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Solution

The fourth proportional to 8,757.40, 13,137.90 and 2,918.20 is: 4,377.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,757.40 : 13,137.90 = 2,918.20 : x
  2. Step 2: Convert to fraction form
    8,757.40/13,137.90 = 2,918.20/x
  3. Step 3: Cross multiply
    8,757.40x = 13,137.90 × 2,918.20
  4. Step 4: Simplify right side
    8,757.40x = 38,339,019.78
  5. Step 5: Solve for x
    x = 38,339,019.78/8,757.40
  6. Step 6: Final answer
    x = 4,377.90

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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.