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Finding the Fourth Proportional to 890.79, 1,336.38 and 305.76

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Solution

The fourth proportional to 890.79, 1,336.38 and 305.76 is: 458.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.79 : 1,336.38 = 305.76 : x
  2. Step 2: Convert to fraction form
    890.79/1,336.38 = 305.76/x
  3. Step 3: Cross multiply
    890.79x = 1,336.38 × 305.76
  4. Step 4: Simplify right side
    890.79x = 408,611.55
  5. Step 5: Solve for x
    x = 408,611.55/890.79
  6. Step 6: Final answer
    x = 458.71

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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.