Home / 20,687.72-31,039.07-12,781.00

Finding the Fourth Proportional to 20,687.72, 31,039.07 and 12,781.00

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Solution

The fourth proportional to 20,687.72, 31,039.07 and 12,781.00 is: 19,176.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,687.72 : 31,039.07 = 12,781.00 : x
  2. Step 2: Convert to fraction form
    20,687.72/31,039.07 = 12,781.00/x
  3. Step 3: Cross multiply
    20,687.72x = 31,039.07 × 12,781.00
  4. Step 4: Simplify right side
    20,687.72x = 396,710,328.56
  5. Step 5: Solve for x
    x = 396,710,328.56/20,687.72
  6. Step 6: Final answer
    x = 19,176.13

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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.