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Finding the Fourth Proportional to 1,115.31, 1,673 and 345.81

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Solution

The fourth proportional to 1,115.31, 1,673 and 345.81 is: 518.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.31 : 1,673 = 345.81 : x
  2. Step 2: Convert to fraction form
    1,115.31/1,673 = 345.81/x
  3. Step 3: Cross multiply
    1,115.31x = 1,673 × 345.81
  4. Step 4: Simplify right side
    1,115.31x = 578,540.13
  5. Step 5: Solve for x
    x = 578,540.13/1,115.31
  6. Step 6: Final answer
    x = 518.73

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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.