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Finding the Fourth Proportional to 20,659.94, 28,509.90 and 11,228.30

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Solution

The fourth proportional to 20,659.94, 28,509.90 and 11,228.30 is: 15,494.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.94 : 28,509.90 = 11,228.30 : x
  2. Step 2: Convert to fraction form
    20,659.94/28,509.90 = 11,228.30/x
  3. Step 3: Cross multiply
    20,659.94x = 28,509.90 × 11,228.30
  4. Step 4: Simplify right side
    20,659.94x = 320,117,567.62
  5. Step 5: Solve for x
    x = 320,117,567.62/20,659.94
  6. Step 6: Final answer
    x = 15,494.61

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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.