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Finding the Fourth Proportional to 931.32, 1,396.74 and 353.88

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Solution

The fourth proportional to 931.32, 1,396.74 and 353.88 is: 530.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.32 : 1,396.74 = 353.88 : x
  2. Step 2: Convert to fraction form
    931.32/1,396.74 = 353.88/x
  3. Step 3: Cross multiply
    931.32x = 1,396.74 × 353.88
  4. Step 4: Simplify right side
    931.32x = 494,278.35
  5. Step 5: Solve for x
    x = 494,278.35/931.32
  6. Step 6: Final answer
    x = 530.73

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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.