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Finding the Fourth Proportional to 5,057.12, 6,978.60 and 2,818.92

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Solution

The fourth proportional to 5,057.12, 6,978.60 and 2,818.92 is: 3,889.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,057.12 : 6,978.60 = 2,818.92 : x
  2. Step 2: Convert to fraction form
    5,057.12/6,978.60 = 2,818.92/x
  3. Step 3: Cross multiply
    5,057.12x = 6,978.60 × 2,818.92
  4. Step 4: Simplify right side
    5,057.12x = 19,672,115.11
  5. Step 5: Solve for x
    x = 19,672,115.11/5,057.12
  6. Step 6: Final answer
    x = 3,889.98

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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.