Home / 20,670.15-31,009.32-8,187.86

Finding the Fourth Proportional to 20,670.15, 31,009.32 and 8,187.86

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Solution

The fourth proportional to 20,670.15, 31,009.32 and 8,187.86 is: 12,283.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670.15 : 31,009.32 = 8,187.86 : x
  2. Step 2: Convert to fraction form
    20,670.15/31,009.32 = 8,187.86/x
  3. Step 3: Cross multiply
    20,670.15x = 31,009.32 × 8,187.86
  4. Step 4: Simplify right side
    20,670.15x = 253,899,815.81
  5. Step 5: Solve for x
    x = 253,899,815.81/20,670.15
  6. Step 6: Final answer
    x = 12,283.40

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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.