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Finding the Fourth Proportional to 572.99, 790.72 and 311

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Solution

The fourth proportional to 572.99, 790.72 and 311 is: 429.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.99 : 790.72 = 311 : x
  2. Step 2: Convert to fraction form
    572.99/790.72 = 311/x
  3. Step 3: Cross multiply
    572.99x = 790.72 × 311
  4. Step 4: Simplify right side
    572.99x = 245,912.37
  5. Step 5: Solve for x
    x = 245,912.37/572.99
  6. Step 6: Final answer
    x = 429.18

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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.