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Finding the Fourth Proportional to 20,640.55, 28,483.95 and 11,209.11

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Solution

The fourth proportional to 20,640.55, 28,483.95 and 11,209.11 is: 15,468.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.55 : 28,483.95 = 11,209.11 : x
  2. Step 2: Convert to fraction form
    20,640.55/28,483.95 = 11,209.11/x
  3. Step 3: Cross multiply
    20,640.55x = 28,483.95 × 11,209.11
  4. Step 4: Simplify right side
    20,640.55x = 319,279,728.78
  5. Step 5: Solve for x
    x = 319,279,728.78/20,640.55
  6. Step 6: Final answer
    x = 15,468.57

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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.