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Finding the Fourth Proportional to 3,946.80, 5,920.20 and 3,658.80

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Solution

The fourth proportional to 3,946.80, 5,920.20 and 3,658.80 is: 5,488.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,946.80 : 5,920.20 = 3,658.80 : x
  2. Step 2: Convert to fraction form
    3,946.80/5,920.20 = 3,658.80/x
  3. Step 3: Cross multiply
    3,946.80x = 5,920.20 × 3,658.80
  4. Step 4: Simplify right side
    3,946.80x = 21,660,827.76
  5. Step 5: Solve for x
    x = 21,660,827.76/3,946.80
  6. Step 6: Final answer
    x = 5,488.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.