Home / 21,003.81-31,505.40-8,523.78

Finding the Fourth Proportional to 21,003.81, 31,505.40 and 8,523.78

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Solution

The fourth proportional to 21,003.81, 31,505.40 and 8,523.78 is: 12,785.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,003.81 : 31,505.40 = 8,523.78 : x
  2. Step 2: Convert to fraction form
    21,003.81/31,505.40 = 8,523.78/x
  3. Step 3: Cross multiply
    21,003.81x = 31,505.40 × 8,523.78
  4. Step 4: Simplify right side
    21,003.81x = 268,545,098.41
  5. Step 5: Solve for x
    x = 268,545,098.41/21,003.81
  6. Step 6: Final answer
    x = 12,785.54

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1.5x scale

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.