Home / 20,855.31-31,287.15-9,168.54

Finding the Fourth Proportional to 20,855.31, 31,287.15 and 9,168.54

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Solution

The fourth proportional to 20,855.31, 31,287.15 and 9,168.54 is: 13,754.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.31 : 31,287.15 = 9,168.54 : x
  2. Step 2: Convert to fraction form
    20,855.31/31,287.15 = 9,168.54/x
  3. Step 3: Cross multiply
    20,855.31x = 31,287.15 × 9,168.54
  4. Step 4: Simplify right side
    20,855.31x = 286,857,486.26
  5. Step 5: Solve for x
    x = 286,857,486.26/20,855.31
  6. Step 6: Final answer
    x = 13,754.65

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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.