Home / 21,789.95-32,643.68-12,878.60

Finding the Fourth Proportional to 21,789.95, 32,643.68 and 12,878.60

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Solution

The fourth proportional to 21,789.95, 32,643.68 and 12,878.60 is: 19,293.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,789.95 : 32,643.68 = 12,878.60 : x
  2. Step 2: Convert to fraction form
    21,789.95/32,643.68 = 12,878.60/x
  3. Step 3: Cross multiply
    21,789.95x = 32,643.68 × 12,878.60
  4. Step 4: Simplify right side
    21,789.95x = 420,404,669.64
  5. Step 5: Solve for x
    x = 420,404,669.64/21,789.95
  6. Step 6: Final answer
    x = 19,293.52

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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.