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Finding the Fourth Proportional to 2,086.25, 3,129.38 and 547.25

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Solution

The fourth proportional to 2,086.25, 3,129.38 and 547.25 is: 820.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,086.25 : 3,129.38 = 547.25 : x
  2. Step 2: Convert to fraction form
    2,086.25/3,129.38 = 547.25/x
  3. Step 3: Cross multiply
    2,086.25x = 3,129.38 × 547.25
  4. Step 4: Simplify right side
    2,086.25x = 1,712,550.47
  5. Step 5: Solve for x
    x = 1,712,550.47/2,086.25
  6. Step 6: Final answer
    x = 820.88

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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.