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Finding the Fourth Proportional to 13,687, 20,528.70 and 5,361.28

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Solution

The fourth proportional to 13,687, 20,528.70 and 5,361.28 is: 8,041.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687 : 20,528.70 = 5,361.28 : x
  2. Step 2: Convert to fraction form
    13,687/20,528.70 = 5,361.28/x
  3. Step 3: Cross multiply
    13,687x = 20,528.70 × 5,361.28
  4. Step 4: Simplify right side
    13,687x = 110,060,108.74
  5. Step 5: Solve for x
    x = 110,060,108.74/13,687
  6. Step 6: Final answer
    x = 8,041.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.