Home / 20,870.08-31,305.20-5,287.68

Finding the Fourth Proportional to 20,870.08, 31,305.20 and 5,287.68

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Solution

The fourth proportional to 20,870.08, 31,305.20 and 5,287.68 is: 7,931.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.08 : 31,305.20 = 5,287.68 : x
  2. Step 2: Convert to fraction form
    20,870.08/31,305.20 = 5,287.68/x
  3. Step 3: Cross multiply
    20,870.08x = 31,305.20 × 5,287.68
  4. Step 4: Simplify right side
    20,870.08x = 165,531,879.94
  5. Step 5: Solve for x
    x = 165,531,879.94/20,870.08
  6. Step 6: Final answer
    x = 7,931.54

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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.