Home / 39,420.21-54,399.72-21,515.21

Finding the Fourth Proportional to 39,420.21, 54,399.72 and 21,515.21

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Solution

The fourth proportional to 39,420.21, 54,399.72 and 21,515.21 is: 29,690.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,420.21 : 54,399.72 = 21,515.21 : x
  2. Step 2: Convert to fraction form
    39,420.21/54,399.72 = 21,515.21/x
  3. Step 3: Cross multiply
    39,420.21x = 54,399.72 × 21,515.21
  4. Step 4: Simplify right side
    39,420.21x = 1,170,421,517.50
  5. Step 5: Solve for x
    x = 1,170,421,517.50/39,420.21
  6. Step 6: Final answer
    x = 29,690.90

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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.