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Finding the Fourth Proportional to 890.70, 1,336.15 and 274.40

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Solution

The fourth proportional to 890.70, 1,336.15 and 274.40 is: 411.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.70 : 1,336.15 = 274.40 : x
  2. Step 2: Convert to fraction form
    890.70/1,336.15 = 274.40/x
  3. Step 3: Cross multiply
    890.70x = 1,336.15 × 274.40
  4. Step 4: Simplify right side
    890.70x = 366,639.56
  5. Step 5: Solve for x
    x = 366,639.56/890.70
  6. Step 6: Final answer
    x = 411.63

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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.