Home / 20,891.05-31,345.76-8,435.36

Finding the Fourth Proportional to 20,891.05, 31,345.76 and 8,435.36

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Solution

The fourth proportional to 20,891.05, 31,345.76 and 8,435.36 is: 12,656.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,891.05 : 31,345.76 = 8,435.36 : x
  2. Step 2: Convert to fraction form
    20,891.05/31,345.76 = 8,435.36/x
  3. Step 3: Cross multiply
    20,891.05x = 31,345.76 × 8,435.36
  4. Step 4: Simplify right side
    20,891.05x = 264,412,869.53
  5. Step 5: Solve for x
    x = 264,412,869.53/20,891.05
  6. Step 6: Final answer
    x = 12,656.75

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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.