Home / 20,858.16-31,288.20-7,708.08

Finding the Fourth Proportional to 20,858.16, 31,288.20 and 7,708.08

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Solution

The fourth proportional to 20,858.16, 31,288.20 and 7,708.08 is: 11,562.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.16 : 31,288.20 = 7,708.08 : x
  2. Step 2: Convert to fraction form
    20,858.16/31,288.20 = 7,708.08/x
  3. Step 3: Cross multiply
    20,858.16x = 31,288.20 × 7,708.08
  4. Step 4: Simplify right side
    20,858.16x = 241,171,948.66
  5. Step 5: Solve for x
    x = 241,171,948.66/20,858.16
  6. Step 6: Final answer
    x = 11,562.47

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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.