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Finding the Fourth Proportional to 11,347.20, 17,020.80 and 5,515.20

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Solution

The fourth proportional to 11,347.20, 17,020.80 and 5,515.20 is: 8,272.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,347.20 : 17,020.80 = 5,515.20 : x
  2. Step 2: Convert to fraction form
    11,347.20/17,020.80 = 5,515.20/x
  3. Step 3: Cross multiply
    11,347.20x = 17,020.80 × 5,515.20
  4. Step 4: Simplify right side
    11,347.20x = 93,873,116.16
  5. Step 5: Solve for x
    x = 93,873,116.16/11,347.20
  6. Step 6: Final answer
    x = 8,272.80

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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.