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Finding the Fourth Proportional to 13,655.79, 18,845.34 and 7,687.67

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Solution

The fourth proportional to 13,655.79, 18,845.34 and 7,687.67 is: 10,609.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,655.79 : 18,845.34 = 7,687.67 : x
  2. Step 2: Convert to fraction form
    13,655.79/18,845.34 = 7,687.67/x
  3. Step 3: Cross multiply
    13,655.79x = 18,845.34 × 7,687.67
  4. Step 4: Simplify right side
    13,655.79x = 144,876,660.73
  5. Step 5: Solve for x
    x = 144,876,660.73/13,655.79
  6. Step 6: Final answer
    x = 10,609.17

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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.