Home / 39,720.67-54,815.52-21,817.36

Finding the Fourth Proportional to 39,720.67, 54,815.52 and 21,817.36

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Solution

The fourth proportional to 39,720.67, 54,815.52 and 21,817.36 is: 30,108.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.67 : 54,815.52 = 21,817.36 : x
  2. Step 2: Convert to fraction form
    39,720.67/54,815.52 = 21,817.36/x
  3. Step 3: Cross multiply
    39,720.67x = 54,815.52 × 21,817.36
  4. Step 4: Simplify right side
    39,720.67x = 1,195,929,933.43
  5. Step 5: Solve for x
    x = 1,195,929,933.43/39,720.67
  6. Step 6: Final answer
    x = 30,108.50

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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.