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Finding the Fourth Proportional to 2,889.78, 3,987.96 and 1,563.48

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Solution

The fourth proportional to 2,889.78, 3,987.96 and 1,563.48 is: 2,157.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,889.78 : 3,987.96 = 1,563.48 : x
  2. Step 2: Convert to fraction form
    2,889.78/3,987.96 = 1,563.48/x
  3. Step 3: Cross multiply
    2,889.78x = 3,987.96 × 1,563.48
  4. Step 4: Simplify right side
    2,889.78x = 6,235,095.70
  5. Step 5: Solve for x
    x = 6,235,095.70/2,889.78
  6. Step 6: Final answer
    x = 2,157.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.