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Finding the Fourth Proportional to 20,591.92, 28,420.95 and 11,639.53

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Solution

The fourth proportional to 20,591.92, 28,420.95 and 11,639.53 is: 16,064.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,591.92 : 28,420.95 = 11,639.53 : x
  2. Step 2: Convert to fraction form
    20,591.92/28,420.95 = 11,639.53/x
  3. Step 3: Cross multiply
    20,591.92x = 28,420.95 × 11,639.53
  4. Step 4: Simplify right side
    20,591.92x = 330,806,500.15
  5. Step 5: Solve for x
    x = 330,806,500.15/20,591.92
  6. Step 6: Final answer
    x = 16,064.87

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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.