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Finding the Fourth Proportional to 3,937.60, 5,911.80 and 3,116.80

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Solution

The fourth proportional to 3,937.60, 5,911.80 and 3,116.80 is: 4,679.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,937.60 : 5,911.80 = 3,116.80 : x
  2. Step 2: Convert to fraction form
    3,937.60/5,911.80 = 3,116.80/x
  3. Step 3: Cross multiply
    3,937.60x = 5,911.80 × 3,116.80
  4. Step 4: Simplify right side
    3,937.60x = 18,425,898.24
  5. Step 5: Solve for x
    x = 18,425,898.24/3,937.60
  6. Step 6: Final answer
    x = 4,679.47

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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.