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Finding the Fourth Proportional to 1,125.31, 1,687.96 and 303.58

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Solution

The fourth proportional to 1,125.31, 1,687.96 and 303.58 is: 455.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.31 : 1,687.96 = 303.58 : x
  2. Step 2: Convert to fraction form
    1,125.31/1,687.96 = 303.58/x
  3. Step 3: Cross multiply
    1,125.31x = 1,687.96 × 303.58
  4. Step 4: Simplify right side
    1,125.31x = 512,434.24
  5. Step 5: Solve for x
    x = 512,434.24/1,125.31
  6. Step 6: Final answer
    x = 455.37

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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.