Home / 20,840.96-31,255.68-9,151.28

Finding the Fourth Proportional to 20,840.96, 31,255.68 and 9,151.28

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Solution

The fourth proportional to 20,840.96, 31,255.68 and 9,151.28 is: 13,724.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.96 : 31,255.68 = 9,151.28 : x
  2. Step 2: Convert to fraction form
    20,840.96/31,255.68 = 9,151.28/x
  3. Step 3: Cross multiply
    20,840.96x = 31,255.68 × 9,151.28
  4. Step 4: Simplify right side
    20,840.96x = 286,029,479.27
  5. Step 5: Solve for x
    x = 286,029,479.27/20,840.96
  6. Step 6: Final answer
    x = 13,724.39

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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.