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Finding the Fourth Proportional to 931.22, 1,395.91 and 345.79

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Solution

The fourth proportional to 931.22, 1,395.91 and 345.79 is: 518.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.22 : 1,395.91 = 345.79 : x
  2. Step 2: Convert to fraction form
    931.22/1,395.91 = 345.79/x
  3. Step 3: Cross multiply
    931.22x = 1,395.91 × 345.79
  4. Step 4: Simplify right side
    931.22x = 482,691.72
  5. Step 5: Solve for x
    x = 482,691.72/931.22
  6. Step 6: Final answer
    x = 518.34

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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.