Home / 5,156.31-7,115.75-2,798.45

Finding the Fourth Proportional to 5,156.31, 7,115.75 and 2,798.45

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Solution

The fourth proportional to 5,156.31, 7,115.75 and 2,798.45 is: 3,861.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,156.31 : 7,115.75 = 2,798.45 : x
  2. Step 2: Convert to fraction form
    5,156.31/7,115.75 = 2,798.45/x
  3. Step 3: Cross multiply
    5,156.31x = 7,115.75 × 2,798.45
  4. Step 4: Simplify right side
    5,156.31x = 19,913,058.19
  5. Step 5: Solve for x
    x = 19,913,058.19/5,156.31
  6. Step 6: Final answer
    x = 3,861.88

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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.