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Finding the Fourth Proportional to 13,696.40, 18,901.60 and 8,658.80

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Solution

The fourth proportional to 13,696.40, 18,901.60 and 8,658.80 is: 11,949.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,696.40 : 18,901.60 = 8,658.80 : x
  2. Step 2: Convert to fraction form
    13,696.40/18,901.60 = 8,658.80/x
  3. Step 3: Cross multiply
    13,696.40x = 18,901.60 × 8,658.80
  4. Step 4: Simplify right side
    13,696.40x = 163,665,174.08
  5. Step 5: Solve for x
    x = 163,665,174.08/13,696.40
  6. Step 6: Final answer
    x = 11,949.50

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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.