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Finding the Fourth Proportional to 1,685.40, 2,527.86 and 531

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Solution

The fourth proportional to 1,685.40, 2,527.86 and 531 is: 796.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.40 : 2,527.86 = 531 : x
  2. Step 2: Convert to fraction form
    1,685.40/2,527.86 = 531/x
  3. Step 3: Cross multiply
    1,685.40x = 2,527.86 × 531
  4. Step 4: Simplify right side
    1,685.40x = 1,342,293.66
  5. Step 5: Solve for x
    x = 1,342,293.66/1,685.40
  6. Step 6: Final answer
    x = 796.42

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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.