Home / 20,681.66-31,019.55-6,639.87

Finding the Fourth Proportional to 20,681.66, 31,019.55 and 6,639.87

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Solution

The fourth proportional to 20,681.66, 31,019.55 and 6,639.87 is: 9,958.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.66 : 31,019.55 = 6,639.87 : x
  2. Step 2: Convert to fraction form
    20,681.66/31,019.55 = 6,639.87/x
  3. Step 3: Cross multiply
    20,681.66x = 31,019.55 × 6,639.87
  4. Step 4: Simplify right side
    20,681.66x = 205,965,779.46
  5. Step 5: Solve for x
    x = 205,965,779.46/20,681.66
  6. Step 6: Final answer
    x = 9,958.86

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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.