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Finding the Fourth Proportional to 1,687.57, 2,531.12 and 591.77

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Solution

The fourth proportional to 1,687.57, 2,531.12 and 591.77 is: 887.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,687.57 : 2,531.12 = 591.77 : x
  2. Step 2: Convert to fraction form
    1,687.57/2,531.12 = 591.77/x
  3. Step 3: Cross multiply
    1,687.57x = 2,531.12 × 591.77
  4. Step 4: Simplify right side
    1,687.57x = 1,497,844.25
  5. Step 5: Solve for x
    x = 1,497,844.25/1,687.57
  6. Step 6: Final answer
    x = 887.58

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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.