Home / 20,620.79-28,456.68-11,189.36

Finding the Fourth Proportional to 20,620.79, 28,456.68 and 11,189.36

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Solution

The fourth proportional to 20,620.79, 28,456.68 and 11,189.36 is: 15,441.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.79 : 28,456.68 = 11,189.36 : x
  2. Step 2: Convert to fraction form
    20,620.79/28,456.68 = 11,189.36/x
  3. Step 3: Cross multiply
    20,620.79x = 28,456.68 × 11,189.36
  4. Step 4: Simplify right side
    20,620.79x = 318,411,894.64
  5. Step 5: Solve for x
    x = 318,411,894.64/20,620.79
  6. Step 6: Final answer
    x = 15,441.31

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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.