Home / 21,178.77-31,769.64-8,699.43

Finding the Fourth Proportional to 21,178.77, 31,769.64 and 8,699.43

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Solution

The fourth proportional to 21,178.77, 31,769.64 and 8,699.43 is: 13,049.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.77 : 31,769.64 = 8,699.43 : x
  2. Step 2: Convert to fraction form
    21,178.77/31,769.64 = 8,699.43/x
  3. Step 3: Cross multiply
    21,178.77x = 31,769.64 × 8,699.43
  4. Step 4: Simplify right side
    21,178.77x = 276,377,759.31
  5. Step 5: Solve for x
    x = 276,377,759.31/21,178.77
  6. Step 6: Final answer
    x = 13,049.75

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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.