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Finding the Fourth Proportional to 1,386.87, 2,081.43 and 565.71

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Solution

The fourth proportional to 1,386.87, 2,081.43 and 565.71 is: 849.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.87 : 2,081.43 = 565.71 : x
  2. Step 2: Convert to fraction form
    1,386.87/2,081.43 = 565.71/x
  3. Step 3: Cross multiply
    1,386.87x = 2,081.43 × 565.71
  4. Step 4: Simplify right side
    1,386.87x = 1,177,485.77
  5. Step 5: Solve for x
    x = 1,177,485.77/1,386.87
  6. Step 6: Final answer
    x = 849.02

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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.