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Finding the Fourth Proportional to 372.78, 514.70 and 279.74

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Solution

The fourth proportional to 372.78, 514.70 and 279.74 is: 386.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.78 : 514.70 = 279.74 : x
  2. Step 2: Convert to fraction form
    372.78/514.70 = 279.74/x
  3. Step 3: Cross multiply
    372.78x = 514.70 × 279.74
  4. Step 4: Simplify right side
    372.78x = 143,978.21
  5. Step 5: Solve for x
    x = 143,978.21/372.78
  6. Step 6: Final answer
    x = 386.23

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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.