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Finding the Fourth Proportional to 20,792.64, 28,672.02 and 13,710

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Solution

The fourth proportional to 20,792.64, 28,672.02 and 13,710 is: 18,905.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,792.64 : 28,672.02 = 13,710 : x
  2. Step 2: Convert to fraction form
    20,792.64/28,672.02 = 13,710/x
  3. Step 3: Cross multiply
    20,792.64x = 28,672.02 × 13,710
  4. Step 4: Simplify right side
    20,792.64x = 393,093,394.20
  5. Step 5: Solve for x
    x = 393,093,394.20/20,792.64
  6. Step 6: Final answer
    x = 18,905.41

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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.