Home / 20,900.81-31,335.08-18,123.66

Finding the Fourth Proportional to 20,900.81, 31,335.08 and 18,123.66

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Solution

The fourth proportional to 20,900.81, 31,335.08 and 18,123.66 is: 27,171.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,900.81 : 31,335.08 = 18,123.66 : x
  2. Step 2: Convert to fraction form
    20,900.81/31,335.08 = 18,123.66/x
  3. Step 3: Cross multiply
    20,900.81x = 31,335.08 × 18,123.66
  4. Step 4: Simplify right side
    20,900.81x = 567,906,245.37
  5. Step 5: Solve for x
    x = 567,906,245.37/20,900.81
  6. Step 6: Final answer
    x = 27,171.50

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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.