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Finding the Fourth Proportional to 20,998, 31,501.32 and 8,686

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Solution

The fourth proportional to 20,998, 31,501.32 and 8,686 is: 13,030.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,998 : 31,501.32 = 8,686 : x
  2. Step 2: Convert to fraction form
    20,998/31,501.32 = 8,686/x
  3. Step 3: Cross multiply
    20,998x = 31,501.32 × 8,686
  4. Step 4: Simplify right side
    20,998x = 273,620,465.52
  5. Step 5: Solve for x
    x = 273,620,465.52/20,998
  6. Step 6: Final answer
    x = 13,030.79

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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.