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Finding the Fourth Proportional to 370.20, 510.79 and 311.41

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Solution

The fourth proportional to 370.20, 510.79 and 311.41 is: 429.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.20 : 510.79 = 311.41 : x
  2. Step 2: Convert to fraction form
    370.20/510.79 = 311.41/x
  3. Step 3: Cross multiply
    370.20x = 510.79 × 311.41
  4. Step 4: Simplify right side
    370.20x = 159,065.11
  5. Step 5: Solve for x
    x = 159,065.11/370.20
  6. Step 6: Final answer
    x = 429.67

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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.