Home / 21,230.88-31,854.96-8,761.20

Finding the Fourth Proportional to 21,230.88, 31,854.96 and 8,761.20

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Solution

The fourth proportional to 21,230.88, 31,854.96 and 8,761.20 is: 13,145.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,230.88 : 31,854.96 = 8,761.20 : x
  2. Step 2: Convert to fraction form
    21,230.88/31,854.96 = 8,761.20/x
  3. Step 3: Cross multiply
    21,230.88x = 31,854.96 × 8,761.20
  4. Step 4: Simplify right side
    21,230.88x = 279,087,675.55
  5. Step 5: Solve for x
    x = 279,087,675.55/21,230.88
  6. Step 6: Final answer
    x = 13,145.37

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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.