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Finding the Fourth Proportional to 11,658.40, 16,087.20 and 6,620.80

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Solution

The fourth proportional to 11,658.40, 16,087.20 and 6,620.80 is: 9,135.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,658.40 : 16,087.20 = 6,620.80 : x
  2. Step 2: Convert to fraction form
    11,658.40/16,087.20 = 6,620.80/x
  3. Step 3: Cross multiply
    11,658.40x = 16,087.20 × 6,620.80
  4. Step 4: Simplify right side
    11,658.40x = 106,510,133.76
  5. Step 5: Solve for x
    x = 106,510,133.76/11,658.40
  6. Step 6: Final answer
    x = 9,135.91

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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.