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Finding the Fourth Proportional to 675.21, 931.79 and 380.54

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Solution

The fourth proportional to 675.21, 931.79 and 380.54 is: 525.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.21 : 931.79 = 380.54 : x
  2. Step 2: Convert to fraction form
    675.21/931.79 = 380.54/x
  3. Step 3: Cross multiply
    675.21x = 931.79 × 380.54
  4. Step 4: Simplify right side
    675.21x = 354,579.56
  5. Step 5: Solve for x
    x = 354,579.56/675.21
  6. Step 6: Final answer
    x = 525.14

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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.