Home / 21,318.87-29,415.55-15,363.75

Finding the Fourth Proportional to 21,318.87, 29,415.55 and 15,363.75

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Solution

The fourth proportional to 21,318.87, 29,415.55 and 15,363.75 is: 21,198.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.87 : 29,415.55 = 15,363.75 : x
  2. Step 2: Convert to fraction form
    21,318.87/29,415.55 = 15,363.75/x
  3. Step 3: Cross multiply
    21,318.87x = 29,415.55 × 15,363.75
  4. Step 4: Simplify right side
    21,318.87x = 451,933,156.31
  5. Step 5: Solve for x
    x = 451,933,156.31/21,318.87
  6. Step 6: Final answer
    x = 21,198.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.