Home / 39,420.88-54,400.43-21,515.73

Finding the Fourth Proportional to 39,420.88, 54,400.43 and 21,515.73

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Solution

The fourth proportional to 39,420.88, 54,400.43 and 21,515.73 is: 29,691.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,420.88 : 54,400.43 = 21,515.73 : x
  2. Step 2: Convert to fraction form
    39,420.88/54,400.43 = 21,515.73/x
  3. Step 3: Cross multiply
    39,420.88x = 54,400.43 × 21,515.73
  4. Step 4: Simplify right side
    39,420.88x = 1,170,464,998.53
  5. Step 5: Solve for x
    x = 1,170,464,998.53/39,420.88
  6. Step 6: Final answer
    x = 29,691.50

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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.