Home / 13,655.21-18,838.10-11,147.68

Finding the Fourth Proportional to 13,655.21, 18,838.10 and 11,147.68

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Solution

The fourth proportional to 13,655.21, 18,838.10 and 11,147.68 is: 15,378.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.21 : 18,838.10 = 11,147.68 : x
  2. Step 2: Convert to fraction form
    13,655.21/18,838.10 = 11,147.68/x
  3. Step 3: Cross multiply
    13,655.21x = 18,838.10 × 11,147.68
  4. Step 4: Simplify right side
    13,655.21x = 210,001,110.61
  5. Step 5: Solve for x
    x = 210,001,110.61/13,655.21
  6. Step 6: Final answer
    x = 15,378.83

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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.