Home / 20,818.79-31,240.40-7,680.32

Finding the Fourth Proportional to 20,818.79, 31,240.40 and 7,680.32

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Solution

The fourth proportional to 20,818.79, 31,240.40 and 7,680.32 is: 11,524.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.79 : 31,240.40 = 7,680.32 : x
  2. Step 2: Convert to fraction form
    20,818.79/31,240.40 = 7,680.32/x
  3. Step 3: Cross multiply
    20,818.79x = 31,240.40 × 7,680.32
  4. Step 4: Simplify right side
    20,818.79x = 239,936,074.32
  5. Step 5: Solve for x
    x = 239,936,074.32/20,818.79
  6. Step 6: Final answer
    x = 11,524.98

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.