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Finding the Fourth Proportional to 370.78, 511.65 and 223.43

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Solution

The fourth proportional to 370.78, 511.65 and 223.43 is: 308.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.78 : 511.65 = 223.43 : x
  2. Step 2: Convert to fraction form
    370.78/511.65 = 223.43/x
  3. Step 3: Cross multiply
    370.78x = 511.65 × 223.43
  4. Step 4: Simplify right side
    370.78x = 114,315.40
  5. Step 5: Solve for x
    x = 114,315.40/370.78
  6. Step 6: Final answer
    x = 308.31

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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.