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Finding the Fourth Proportional to 20,640.71, 28,484.52 and 11,687.98

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Solution

The fourth proportional to 20,640.71, 28,484.52 and 11,687.98 is: 16,129.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.71 : 28,484.52 = 11,687.98 : x
  2. Step 2: Convert to fraction form
    20,640.71/28,484.52 = 11,687.98/x
  3. Step 3: Cross multiply
    20,640.71x = 28,484.52 × 11,687.98
  4. Step 4: Simplify right side
    20,640.71x = 332,926,441.63
  5. Step 5: Solve for x
    x = 332,926,441.63/20,640.71
  6. Step 6: Final answer
    x = 16,129.60

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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.