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Finding the Fourth Proportional to 890.78, 1,336.37 and 305.76

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Solution

The fourth proportional to 890.78, 1,336.37 and 305.76 is: 458.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.78 : 1,336.37 = 305.76 : x
  2. Step 2: Convert to fraction form
    890.78/1,336.37 = 305.76/x
  3. Step 3: Cross multiply
    890.78x = 1,336.37 × 305.76
  4. Step 4: Simplify right side
    890.78x = 408,604.46
  5. Step 5: Solve for x
    x = 408,604.46/890.78
  6. Step 6: Final answer
    x = 458.70

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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.