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Finding the Fourth Proportional to 312.70, 432.60 and 274

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Solution

The fourth proportional to 312.70, 432.60 and 274 is: 379.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.70 : 432.60 = 274 : x
  2. Step 2: Convert to fraction form
    312.70/432.60 = 274/x
  3. Step 3: Cross multiply
    312.70x = 432.60 × 274
  4. Step 4: Simplify right side
    312.70x = 118,532.40
  5. Step 5: Solve for x
    x = 118,532.40/312.70
  6. Step 6: Final answer
    x = 379.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.