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Finding the Fourth Proportional to 11,121.90, 16,681.77 and 2,913.90

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Solution

The fourth proportional to 11,121.90, 16,681.77 and 2,913.90 is: 4,370.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,121.90 : 16,681.77 = 2,913.90 : x
  2. Step 2: Convert to fraction form
    11,121.90/16,681.77 = 2,913.90/x
  3. Step 3: Cross multiply
    11,121.90x = 16,681.77 × 2,913.90
  4. Step 4: Simplify right side
    11,121.90x = 48,609,009.60
  5. Step 5: Solve for x
    x = 48,609,009.60/11,121.90
  6. Step 6: Final answer
    x = 4,370.57

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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.