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Finding the Fourth Proportional to 2,891.81, 3,990.69 and 1,565.51

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Solution

The fourth proportional to 2,891.81, 3,990.69 and 1,565.51 is: 2,160.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.81 : 3,990.69 = 1,565.51 : x
  2. Step 2: Convert to fraction form
    2,891.81/3,990.69 = 1,565.51/x
  3. Step 3: Cross multiply
    2,891.81x = 3,990.69 × 1,565.51
  4. Step 4: Simplify right side
    2,891.81x = 6,247,462.17
  5. Step 5: Solve for x
    x = 6,247,462.17/2,891.81
  6. Step 6: Final answer
    x = 2,160.40

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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.