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Finding the Fourth Proportional to 20,659.50, 28,509.90 and 11,228.10

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Solution

The fourth proportional to 20,659.50, 28,509.90 and 11,228.10 is: 15,494.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.50 : 28,509.90 = 11,228.10 : x
  2. Step 2: Convert to fraction form
    20,659.50/28,509.90 = 11,228.10/x
  3. Step 3: Cross multiply
    20,659.50x = 28,509.90 × 11,228.10
  4. Step 4: Simplify right side
    20,659.50x = 320,112,008.19
  5. Step 5: Solve for x
    x = 320,112,008.19/20,659.50
  6. Step 6: Final answer
    x = 15,494.66

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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.