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Finding the Fourth Proportional to 2,807.78, 4,207.92 and 2,155.31

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Solution

The fourth proportional to 2,807.78, 4,207.92 and 2,155.31 is: 3,230.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.78 : 4,207.92 = 2,155.31 : x
  2. Step 2: Convert to fraction form
    2,807.78/4,207.92 = 2,155.31/x
  3. Step 3: Cross multiply
    2,807.78x = 4,207.92 × 2,155.31
  4. Step 4: Simplify right side
    2,807.78x = 9,069,372.06
  5. Step 5: Solve for x
    x = 9,069,372.06/2,807.78
  6. Step 6: Final answer
    x = 3,230.09

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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.