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Finding the Fourth Proportional to 3,909.87, 5,392.78 and 3,674.77

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Solution

The fourth proportional to 3,909.87, 5,392.78 and 3,674.77 is: 5,068.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.87 : 5,392.78 = 3,674.77 : x
  2. Step 2: Convert to fraction form
    3,909.87/5,392.78 = 3,674.77/x
  3. Step 3: Cross multiply
    3,909.87x = 5,392.78 × 3,674.77
  4. Step 4: Simplify right side
    3,909.87x = 19,817,203.49
  5. Step 5: Solve for x
    x = 19,817,203.49/3,909.87
  6. Step 6: Final answer
    x = 5,068.51

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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.