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Finding the Fourth Proportional to 1,687.63, 2,529.81 and 866.29

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Solution

The fourth proportional to 1,687.63, 2,529.81 and 866.29 is: 1,298.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.63 : 2,529.81 = 866.29 : x
  2. Step 2: Convert to fraction form
    1,687.63/2,529.81 = 866.29/x
  3. Step 3: Cross multiply
    1,687.63x = 2,529.81 × 866.29
  4. Step 4: Simplify right side
    1,687.63x = 2,191,549.10
  5. Step 5: Solve for x
    x = 2,191,549.10/1,687.63
  6. Step 6: Final answer
    x = 1,298.60

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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.