Home / 20,859.40-31,202.70-18,785.80

Finding the Fourth Proportional to 20,859.40, 31,202.70 and 18,785.80

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Solution

The fourth proportional to 20,859.40, 31,202.70 and 18,785.80 is: 28,100.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,859.40 : 31,202.70 = 18,785.80 : x
  2. Step 2: Convert to fraction form
    20,859.40/31,202.70 = 18,785.80/x
  3. Step 3: Cross multiply
    20,859.40x = 31,202.70 × 18,785.80
  4. Step 4: Simplify right side
    20,859.40x = 586,167,681.66
  5. Step 5: Solve for x
    x = 586,167,681.66/20,859.40
  6. Step 6: Final answer
    x = 28,100.89

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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.