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Finding the Fourth Proportional to 1,686, 2,528.12 and 760.76

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Solution

The fourth proportional to 1,686, 2,528.12 and 760.76 is: 1,140.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686 : 2,528.12 = 760.76 : x
  2. Step 2: Convert to fraction form
    1,686/2,528.12 = 760.76/x
  3. Step 3: Cross multiply
    1,686x = 2,528.12 × 760.76
  4. Step 4: Simplify right side
    1,686x = 1,923,292.57
  5. Step 5: Solve for x
    x = 1,923,292.57/1,686
  6. Step 6: Final answer
    x = 1,140.74

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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.