Home / 20,578.72-28,398.54-11,147.31

Finding the Fourth Proportional to 20,578.72, 28,398.54 and 11,147.31

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Solution

The fourth proportional to 20,578.72, 28,398.54 and 11,147.31 is: 15,383.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.72 : 28,398.54 = 11,147.31 : x
  2. Step 2: Convert to fraction form
    20,578.72/28,398.54 = 11,147.31/x
  3. Step 3: Cross multiply
    20,578.72x = 28,398.54 × 11,147.31
  4. Step 4: Simplify right side
    20,578.72x = 316,567,328.93
  5. Step 5: Solve for x
    x = 316,567,328.93/20,578.72
  6. Step 6: Final answer
    x = 15,383.24

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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.