Home / 15,138.12-20,872.47-9,831

Finding the Fourth Proportional to 15,138.12, 20,872.47 and 9,831

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Solution

The fourth proportional to 15,138.12, 20,872.47 and 9,831 is: 13,555.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,138.12 : 20,872.47 = 9,831 : x
  2. Step 2: Convert to fraction form
    15,138.12/20,872.47 = 9,831/x
  3. Step 3: Cross multiply
    15,138.12x = 20,872.47 × 9,831
  4. Step 4: Simplify right side
    15,138.12x = 205,197,252.57
  5. Step 5: Solve for x
    x = 205,197,252.57/15,138.12
  6. Step 6: Final answer
    x = 13,555.00

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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.