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Finding the Fourth Proportional to 931.79, 1,396.46 and 443.88

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Solution

The fourth proportional to 931.79, 1,396.46 and 443.88 is: 665.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.79 : 1,396.46 = 443.88 : x
  2. Step 2: Convert to fraction form
    931.79/1,396.46 = 443.88/x
  3. Step 3: Cross multiply
    931.79x = 1,396.46 × 443.88
  4. Step 4: Simplify right side
    931.79x = 619,861.77
  5. Step 5: Solve for x
    x = 619,861.77/931.79
  6. Step 6: Final answer
    x = 665.24

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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.