Home / 39,720.43-54,815.13-21,815.81

Finding the Fourth Proportional to 39,720.43, 54,815.13 and 21,815.81

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Solution

The fourth proportional to 39,720.43, 54,815.13 and 21,815.81 is: 30,106.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.43 : 54,815.13 = 21,815.81 : x
  2. Step 2: Convert to fraction form
    39,720.43/54,815.13 = 21,815.81/x
  3. Step 3: Cross multiply
    39,720.43x = 54,815.13 × 21,815.81
  4. Step 4: Simplify right side
    39,720.43x = 1,195,836,461.21
  5. Step 5: Solve for x
    x = 1,195,836,461.21/39,720.43
  6. Step 6: Final answer
    x = 30,106.34

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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.