Home / 20,818.80-28,728.72-11,386.80

Finding the Fourth Proportional to 20,818.80, 28,728.72 and 11,386.80

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Solution

The fourth proportional to 20,818.80, 28,728.72 and 11,386.80 is: 15,713.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,818.80 : 28,728.72 = 11,386.80 : x
  2. Step 2: Convert to fraction form
    20,818.80/28,728.72 = 11,386.80/x
  3. Step 3: Cross multiply
    20,818.80x = 28,728.72 × 11,386.80
  4. Step 4: Simplify right side
    20,818.80x = 327,128,188.90
  5. Step 5: Solve for x
    x = 327,128,188.90/20,818.80
  6. Step 6: Final answer
    x = 15,713.11

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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.