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Finding the Fourth Proportional to 20,640.56, 28,483.95 and 11,209.12

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Solution

The fourth proportional to 20,640.56, 28,483.95 and 11,209.12 is: 15,468.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.56 : 28,483.95 = 11,209.12 : x
  2. Step 2: Convert to fraction form
    20,640.56/28,483.95 = 11,209.12/x
  3. Step 3: Cross multiply
    20,640.56x = 28,483.95 × 11,209.12
  4. Step 4: Simplify right side
    20,640.56x = 319,279,984.45
  5. Step 5: Solve for x
    x = 319,279,984.45/20,640.56
  6. Step 6: Final answer
    x = 15,468.58

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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.