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Finding the Fourth Proportional to 13,655.70, 18,844.07 and 7,687.13

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Solution

The fourth proportional to 13,655.70, 18,844.07 and 7,687.13 is: 10,607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.70 : 18,844.07 = 7,687.13 : x
  2. Step 2: Convert to fraction form
    13,655.70/18,844.07 = 7,687.13/x
  3. Step 3: Cross multiply
    13,655.70x = 18,844.07 × 7,687.13
  4. Step 4: Simplify right side
    13,655.70x = 144,856,683.16
  5. Step 5: Solve for x
    x = 144,856,683.16/13,655.70
  6. Step 6: Final answer
    x = 10,607.78

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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.