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Finding the Fourth Proportional to 7,778.52, 11,668.95 and 2,780.49

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Solution

The fourth proportional to 7,778.52, 11,668.95 and 2,780.49 is: 4,171.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,778.52 : 11,668.95 = 2,780.49 : x
  2. Step 2: Convert to fraction form
    7,778.52/11,668.95 = 2,780.49/x
  3. Step 3: Cross multiply
    7,778.52x = 11,668.95 × 2,780.49
  4. Step 4: Simplify right side
    7,778.52x = 32,445,398.79
  5. Step 5: Solve for x
    x = 32,445,398.79/7,778.52
  6. Step 6: Final answer
    x = 4,171.15

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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.