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Finding the Fourth Proportional to 13,679.70, 18,876.85 and 7,712.83

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Solution

The fourth proportional to 13,679.70, 18,876.85 and 7,712.83 is: 10,643.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679.70 : 18,876.85 = 7,712.83 : x
  2. Step 2: Convert to fraction form
    13,679.70/18,876.85 = 7,712.83/x
  3. Step 3: Cross multiply
    13,679.70x = 18,876.85 × 7,712.83
  4. Step 4: Simplify right side
    13,679.70x = 145,593,896.42
  5. Step 5: Solve for x
    x = 145,593,896.42/13,679.70
  6. Step 6: Final answer
    x = 10,643.07

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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.