Home / 20,578.79-28,398.87-11,147.36

Finding the Fourth Proportional to 20,578.79, 28,398.87 and 11,147.36

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Solution

The fourth proportional to 20,578.79, 28,398.87 and 11,147.36 is: 15,383.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,578.79 : 28,398.87 = 11,147.36 : x
  2. Step 2: Convert to fraction form
    20,578.79/28,398.87 = 11,147.36/x
  3. Step 3: Cross multiply
    20,578.79x = 28,398.87 × 11,147.36
  4. Step 4: Simplify right side
    20,578.79x = 316,572,285.49
  5. Step 5: Solve for x
    x = 316,572,285.49/20,578.79
  6. Step 6: Final answer
    x = 15,383.42

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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.