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Finding the Fourth Proportional to 13,655.36, 18,843.90 and 7,686.68

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Solution

The fourth proportional to 13,655.36, 18,843.90 and 7,686.68 is: 10,607.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.36 : 18,843.90 = 7,686.68 : x
  2. Step 2: Convert to fraction form
    13,655.36/18,843.90 = 7,686.68/x
  3. Step 3: Cross multiply
    13,655.36x = 18,843.90 × 7,686.68
  4. Step 4: Simplify right side
    13,655.36x = 144,846,935.03
  5. Step 5: Solve for x
    x = 144,846,935.03/13,655.36
  6. Step 6: Final answer
    x = 10,607.34

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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.