Home / 21,319.95-31,961.69-8,181.75

Finding the Fourth Proportional to 21,319.95, 31,961.69 and 8,181.75

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Solution

The fourth proportional to 21,319.95, 31,961.69 and 8,181.75 is: 12,265.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,319.95 : 31,961.69 = 8,181.75 : x
  2. Step 2: Convert to fraction form
    21,319.95/31,961.69 = 8,181.75/x
  3. Step 3: Cross multiply
    21,319.95x = 31,961.69 × 8,181.75
  4. Step 4: Simplify right side
    21,319.95x = 261,502,557.16
  5. Step 5: Solve for x
    x = 261,502,557.16/21,319.95
  6. Step 6: Final answer
    x = 12,265.63

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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.