Home / 28,505.21-39,349.68-21,791.12

Finding the Fourth Proportional to 28,505.21, 39,349.68 and 21,791.12

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Solution

The fourth proportional to 28,505.21, 39,349.68 and 21,791.12 is: 30,081.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,505.21 : 39,349.68 = 21,791.12 : x
  2. Step 2: Convert to fraction form
    28,505.21/39,349.68 = 21,791.12/x
  3. Step 3: Cross multiply
    28,505.21x = 39,349.68 × 21,791.12
  4. Step 4: Simplify right side
    28,505.21x = 857,473,598.84
  5. Step 5: Solve for x
    x = 857,473,598.84/28,505.21
  6. Step 6: Final answer
    x = 30,081.29

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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.