Home / 21,178.20-31,781.90-7,327.20

Finding the Fourth Proportional to 21,178.20, 31,781.90 and 7,327.20

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Solution

The fourth proportional to 21,178.20, 31,781.90 and 7,327.20 is: 10,995.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.20 : 31,781.90 = 7,327.20 : x
  2. Step 2: Convert to fraction form
    21,178.20/31,781.90 = 7,327.20/x
  3. Step 3: Cross multiply
    21,178.20x = 31,781.90 × 7,327.20
  4. Step 4: Simplify right side
    21,178.20x = 232,872,337.68
  5. Step 5: Solve for x
    x = 232,872,337.68/21,178.20
  6. Step 6: Final answer
    x = 10,995.85

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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.