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Finding the Fourth Proportional to 370.58, 511.31 and 311.78

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Solution

The fourth proportional to 370.58, 511.31 and 311.78 is: 430.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.58 : 511.31 = 311.78 : x
  2. Step 2: Convert to fraction form
    370.58/511.31 = 311.78/x
  3. Step 3: Cross multiply
    370.58x = 511.31 × 311.78
  4. Step 4: Simplify right side
    370.58x = 159,418.29
  5. Step 5: Solve for x
    x = 159,418.29/370.58
  6. Step 6: Final answer
    x = 430.19

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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.