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Finding the Fourth Proportional to 13,689.48, 18,900.54 and 12,747.60

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Solution

The fourth proportional to 13,689.48, 18,900.54 and 12,747.60 is: 17,600.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.48 : 18,900.54 = 12,747.60 : x
  2. Step 2: Convert to fraction form
    13,689.48/18,900.54 = 12,747.60/x
  3. Step 3: Cross multiply
    13,689.48x = 18,900.54 × 12,747.60
  4. Step 4: Simplify right side
    13,689.48x = 240,936,523.70
  5. Step 5: Solve for x
    x = 240,936,523.70/13,689.48
  6. Step 6: Final answer
    x = 17,600.12

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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.