Home / 20,917.08-31,403.40-12,158.28

Finding the Fourth Proportional to 20,917.08, 31,403.40 and 12,158.28

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Solution

The fourth proportional to 20,917.08, 31,403.40 and 12,158.28 is: 18,253.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.08 : 31,403.40 = 12,158.28 : x
  2. Step 2: Convert to fraction form
    20,917.08/31,403.40 = 12,158.28/x
  3. Step 3: Cross multiply
    20,917.08x = 31,403.40 × 12,158.28
  4. Step 4: Simplify right side
    20,917.08x = 381,811,330.15
  5. Step 5: Solve for x
    x = 381,811,330.15/20,917.08
  6. Step 6: Final answer
    x = 18,253.57

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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.