Home / 20,870.26-31,305.49-5,287.88

Finding the Fourth Proportional to 20,870.26, 31,305.49 and 5,287.88

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Solution

The fourth proportional to 20,870.26, 31,305.49 and 5,287.88 is: 7,931.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.26 : 31,305.49 = 5,287.88 : x
  2. Step 2: Convert to fraction form
    20,870.26/31,305.49 = 5,287.88/x
  3. Step 3: Cross multiply
    20,870.26x = 31,305.49 × 5,287.88
  4. Step 4: Simplify right side
    20,870.26x = 165,539,739.51
  5. Step 5: Solve for x
    x = 165,539,739.51/20,870.26
  6. Step 6: Final answer
    x = 7,931.85

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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.