Home / 39,120.85-53,986.80-21,215.80

Finding the Fourth Proportional to 39,120.85, 53,986.80 and 21,215.80

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Solution

The fourth proportional to 39,120.85, 53,986.80 and 21,215.80 is: 29,277.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,120.85 : 53,986.80 = 21,215.80 : x
  2. Step 2: Convert to fraction form
    39,120.85/53,986.80 = 21,215.80/x
  3. Step 3: Cross multiply
    39,120.85x = 53,986.80 × 21,215.80
  4. Step 4: Simplify right side
    39,120.85x = 1,145,373,151.44
  5. Step 5: Solve for x
    x = 1,145,373,151.44/39,120.85
  6. Step 6: Final answer
    x = 29,277.82

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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.