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Finding the Fourth Proportional to 13,287.34, 18,203.75 and 12,789.10

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Solution

The fourth proportional to 13,287.34, 18,203.75 and 12,789.10 is: 17,521.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,287.34 : 18,203.75 = 12,789.10 : x
  2. Step 2: Convert to fraction form
    13,287.34/18,203.75 = 12,789.10/x
  3. Step 3: Cross multiply
    13,287.34x = 18,203.75 × 12,789.10
  4. Step 4: Simplify right side
    13,287.34x = 232,809,515.18
  5. Step 5: Solve for x
    x = 232,809,515.18/13,287.34
  6. Step 6: Final answer
    x = 17,521.15

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These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.