Home / 20,787.42-31,194.80-7,639.91

Finding the Fourth Proportional to 20,787.42, 31,194.80 and 7,639.91

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Solution

The fourth proportional to 20,787.42, 31,194.80 and 7,639.91 is: 11,464.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,787.42 : 31,194.80 = 7,639.91 : x
  2. Step 2: Convert to fraction form
    20,787.42/31,194.80 = 7,639.91/x
  3. Step 3: Cross multiply
    20,787.42x = 31,194.80 × 7,639.91
  4. Step 4: Simplify right side
    20,787.42x = 238,325,464.47
  5. Step 5: Solve for x
    x = 238,325,464.47/20,787.42
  6. Step 6: Final answer
    x = 11,464.89

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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.