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Finding the Fourth Proportional to 931, 1,396.74 and 346

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Solution

The fourth proportional to 931, 1,396.74 and 346 is: 519.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    931 : 1,396.74 = 346 : x
  2. Step 2: Convert to fraction form
    931/1,396.74 = 346/x
  3. Step 3: Cross multiply
    931x = 1,396.74 × 346
  4. Step 4: Simplify right side
    931x = 483,272.04
  5. Step 5: Solve for x
    x = 483,272.04/931
  6. Step 6: Final answer
    x = 519.09

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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.