Home / 20,731.80-31,089.96-6,688.30

Finding the Fourth Proportional to 20,731.80, 31,089.96 and 6,688.30

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Solution

The fourth proportional to 20,731.80, 31,089.96 and 6,688.30 is: 10,029.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.80 : 31,089.96 = 6,688.30 : x
  2. Step 2: Convert to fraction form
    20,731.80/31,089.96 = 6,688.30/x
  3. Step 3: Cross multiply
    20,731.80x = 31,089.96 × 6,688.30
  4. Step 4: Simplify right side
    20,731.80x = 207,938,979.47
  5. Step 5: Solve for x
    x = 207,938,979.47/20,731.80
  6. Step 6: Final answer
    x = 10,029.95

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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.