Home / 21,213.29-31,830.87-8,742.53

Finding the Fourth Proportional to 21,213.29, 31,830.87 and 8,742.53

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Solution

The fourth proportional to 21,213.29, 31,830.87 and 8,742.53 is: 13,118.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,213.29 : 31,830.87 = 8,742.53 : x
  2. Step 2: Convert to fraction form
    21,213.29/31,830.87 = 8,742.53/x
  3. Step 3: Cross multiply
    21,213.29x = 31,830.87 × 8,742.53
  4. Step 4: Simplify right side
    21,213.29x = 278,282,335.90
  5. Step 5: Solve for x
    x = 278,282,335.90/21,213.29
  6. Step 6: Final answer
    x = 13,118.30

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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.