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Finding the Fourth Proportional to 8,763.86, 13,142.91 and 2,918.90

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Solution

The fourth proportional to 8,763.86, 13,142.91 and 2,918.90 is: 4,377.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,763.86 : 13,142.91 = 2,918.90 : x
  2. Step 2: Convert to fraction form
    8,763.86/13,142.91 = 2,918.90/x
  3. Step 3: Cross multiply
    8,763.86x = 13,142.91 × 2,918.90
  4. Step 4: Simplify right side
    8,763.86x = 38,362,840.00
  5. Step 5: Solve for x
    x = 38,362,840.00/8,763.86
  6. Step 6: Final answer
    x = 4,377.39

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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.