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Finding the Fourth Proportional to 13,687.70, 18,889.30 and 7,718.20

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Solution

The fourth proportional to 13,687.70, 18,889.30 and 7,718.20 is: 10,651.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.70 : 18,889.30 = 7,718.20 : x
  2. Step 2: Convert to fraction form
    13,687.70/18,889.30 = 7,718.20/x
  3. Step 3: Cross multiply
    13,687.70x = 18,889.30 × 7,718.20
  4. Step 4: Simplify right side
    13,687.70x = 145,791,463.94
  5. Step 5: Solve for x
    x = 145,791,463.94/13,687.70
  6. Step 6: Final answer
    x = 10,651.28

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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.