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Finding the Fourth Proportional to 1,687.86, 2,533.31 and 810.90

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Solution

The fourth proportional to 1,687.86, 2,533.31 and 810.90 is: 1,217.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.86 : 2,533.31 = 810.90 : x
  2. Step 2: Convert to fraction form
    1,687.86/2,533.31 = 810.90/x
  3. Step 3: Cross multiply
    1,687.86x = 2,533.31 × 810.90
  4. Step 4: Simplify right side
    1,687.86x = 2,054,257.02
  5. Step 5: Solve for x
    x = 2,054,257.02/1,687.86
  6. Step 6: Final answer
    x = 1,217.08

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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.