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Finding the Fourth Proportional to 1,687.42, 2,531.84 and 907.21

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Solution

The fourth proportional to 1,687.42, 2,531.84 and 907.21 is: 1,361.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.42 : 2,531.84 = 907.21 : x
  2. Step 2: Convert to fraction form
    1,687.42/2,531.84 = 907.21/x
  3. Step 3: Cross multiply
    1,687.42x = 2,531.84 × 907.21
  4. Step 4: Simplify right side
    1,687.42x = 2,296,910.57
  5. Step 5: Solve for x
    x = 2,296,910.57/1,687.42
  6. Step 6: Final answer
    x = 1,361.20

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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.