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Finding the Fourth Proportional to 2,891.81, 3,990.66 and 1,565.49

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Solution

The fourth proportional to 2,891.81, 3,990.66 and 1,565.49 is: 2,160.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.81 : 3,990.66 = 1,565.49 : x
  2. Step 2: Convert to fraction form
    2,891.81/3,990.66 = 1,565.49/x
  3. Step 3: Cross multiply
    2,891.81x = 3,990.66 × 1,565.49
  4. Step 4: Simplify right side
    2,891.81x = 6,247,338.32
  5. Step 5: Solve for x
    x = 6,247,338.32/2,891.81
  6. Step 6: Final answer
    x = 2,160.36

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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.