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Finding the Fourth Proportional to 2,778.78, 4,167.15 and 830.32

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Solution

The fourth proportional to 2,778.78, 4,167.15 and 830.32 is: 1,245.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,778.78 : 4,167.15 = 830.32 : x
  2. Step 2: Convert to fraction form
    2,778.78/4,167.15 = 830.32/x
  3. Step 3: Cross multiply
    2,778.78x = 4,167.15 × 830.32
  4. Step 4: Simplify right side
    2,778.78x = 3,460,067.99
  5. Step 5: Solve for x
    x = 3,460,067.99/2,778.78
  6. Step 6: Final answer
    x = 1,245.18

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1.5x scale

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.