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Finding the Fourth Proportional to 508.28, 701.76 and 311.99

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Solution

The fourth proportional to 508.28, 701.76 and 311.99 is: 430.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.28 : 701.76 = 311.99 : x
  2. Step 2: Convert to fraction form
    508.28/701.76 = 311.99/x
  3. Step 3: Cross multiply
    508.28x = 701.76 × 311.99
  4. Step 4: Simplify right side
    508.28x = 218,942.10
  5. Step 5: Solve for x
    x = 218,942.10/508.28
  6. Step 6: Final answer
    x = 430.75

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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.