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Finding the Fourth Proportional to 3,969.68, 5,478.30 and 2,291.66

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Solution

The fourth proportional to 3,969.68, 5,478.30 and 2,291.66 is: 3,162.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,969.68 : 5,478.30 = 2,291.66 : x
  2. Step 2: Convert to fraction form
    3,969.68/5,478.30 = 2,291.66/x
  3. Step 3: Cross multiply
    3,969.68x = 5,478.30 × 2,291.66
  4. Step 4: Simplify right side
    3,969.68x = 12,554,400.98
  5. Step 5: Solve for x
    x = 12,554,400.98/3,969.68
  6. Step 6: Final answer
    x = 3,162.57

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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.