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Finding the Fourth Proportional to 1,374.87, 2,063.22 and 644.51

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Solution

The fourth proportional to 1,374.87, 2,063.22 and 644.51 is: 967.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.87 : 2,063.22 = 644.51 : x
  2. Step 2: Convert to fraction form
    1,374.87/2,063.22 = 644.51/x
  3. Step 3: Cross multiply
    1,374.87x = 2,063.22 × 644.51
  4. Step 4: Simplify right side
    1,374.87x = 1,329,760.68
  5. Step 5: Solve for x
    x = 1,329,760.68/1,374.87
  6. Step 6: Final answer
    x = 967.19

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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.