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Finding the Fourth Proportional to 890.80, 1,336.16 and 305.86

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Solution

The fourth proportional to 890.80, 1,336.16 and 305.86 is: 458.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.80 : 1,336.16 = 305.86 : x
  2. Step 2: Convert to fraction form
    890.80/1,336.16 = 305.86/x
  3. Step 3: Cross multiply
    890.80x = 1,336.16 × 305.86
  4. Step 4: Simplify right side
    890.80x = 408,669.69
  5. Step 5: Solve for x
    x = 408,669.69/890.80
  6. Step 6: Final answer
    x = 458.77

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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.