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Finding the Fourth Proportional to 18,687, 28,033.20 and 13,012.32

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Solution

The fourth proportional to 18,687, 28,033.20 and 13,012.32 is: 19,520.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,687 : 28,033.20 = 13,012.32 : x
  2. Step 2: Convert to fraction form
    18,687/28,033.20 = 13,012.32/x
  3. Step 3: Cross multiply
    18,687x = 28,033.20 × 13,012.32
  4. Step 4: Simplify right side
    18,687x = 364,776,969.02
  5. Step 5: Solve for x
    x = 364,776,969.02/18,687
  6. Step 6: Final answer
    x = 19,520.36

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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.