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Finding the Fourth Proportional to 20,667.53, 28,532.88 and 15,813.11

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Solution

The fourth proportional to 20,667.53, 28,532.88 and 15,813.11 is: 21,831.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,667.53 : 28,532.88 = 15,813.11 : x
  2. Step 2: Convert to fraction form
    20,667.53/28,532.88 = 15,813.11/x
  3. Step 3: Cross multiply
    20,667.53x = 28,532.88 × 15,813.11
  4. Step 4: Simplify right side
    20,667.53x = 451,193,427.39
  5. Step 5: Solve for x
    x = 451,193,427.39/20,667.53
  6. Step 6: Final answer
    x = 21,831.03

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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.