Home / 39,720.12-54,810.52-21,815.04

Finding the Fourth Proportional to 39,720.12, 54,810.52 and 21,815.04

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Solution

The fourth proportional to 39,720.12, 54,810.52 and 21,815.04 is: 30,102.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,720.12 : 54,810.52 = 21,815.04 : x
  2. Step 2: Convert to fraction form
    39,720.12/54,810.52 = 21,815.04/x
  3. Step 3: Cross multiply
    39,720.12x = 54,810.52 × 21,815.04
  4. Step 4: Simplify right side
    39,720.12x = 1,195,693,686.22
  5. Step 5: Solve for x
    x = 1,195,693,686.22/39,720.12
  6. Step 6: Final answer
    x = 30,102.97

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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.