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Finding the Fourth Proportional to 675.31, 931.91 and 380.57

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Solution

The fourth proportional to 675.31, 931.91 and 380.57 is: 525.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.31 : 931.91 = 380.57 : x
  2. Step 2: Convert to fraction form
    675.31/931.91 = 380.57/x
  3. Step 3: Cross multiply
    675.31x = 931.91 × 380.57
  4. Step 4: Simplify right side
    675.31x = 354,658.37
  5. Step 5: Solve for x
    x = 354,658.37/675.31
  6. Step 6: Final answer
    x = 525.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.