Home / 20,821.78-28,734.09-11,390.35

Finding the Fourth Proportional to 20,821.78, 28,734.09 and 11,390.35

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Solution

The fourth proportional to 20,821.78, 28,734.09 and 11,390.35 is: 15,718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.78 : 28,734.09 = 11,390.35 : x
  2. Step 2: Convert to fraction form
    20,821.78/28,734.09 = 11,390.35/x
  3. Step 3: Cross multiply
    20,821.78x = 28,734.09 × 11,390.35
  4. Step 4: Simplify right side
    20,821.78x = 327,291,342.03
  5. Step 5: Solve for x
    x = 327,291,342.03/20,821.78
  6. Step 6: Final answer
    x = 15,718.70

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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.