Home / 39,720.68-54,815.10-21,817.34

Finding the Fourth Proportional to 39,720.68, 54,815.10 and 21,817.34

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Solution

The fourth proportional to 39,720.68, 54,815.10 and 21,817.34 is: 30,108.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.68 : 54,815.10 = 21,817.34 : x
  2. Step 2: Convert to fraction form
    39,720.68/54,815.10 = 21,817.34/x
  3. Step 3: Cross multiply
    39,720.68x = 54,815.10 × 21,817.34
  4. Step 4: Simplify right side
    39,720.68x = 1,195,919,673.83
  5. Step 5: Solve for x
    x = 1,195,919,673.83/39,720.68
  6. Step 6: Final answer
    x = 30,108.24

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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.