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Finding the Fourth Proportional to 6,618.90, 9,914.55 and 3,111.90

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Solution

The fourth proportional to 6,618.90, 9,914.55 and 3,111.90 is: 4,661.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,618.90 : 9,914.55 = 3,111.90 : x
  2. Step 2: Convert to fraction form
    6,618.90/9,914.55 = 3,111.90/x
  3. Step 3: Cross multiply
    6,618.90x = 9,914.55 × 3,111.90
  4. Step 4: Simplify right side
    6,618.90x = 30,853,088.15
  5. Step 5: Solve for x
    x = 30,853,088.15/6,618.90
  6. Step 6: Final answer
    x = 4,661.36

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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.