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Finding the Fourth Proportional to 532.71, 734.90 and 311.56

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Solution

The fourth proportional to 532.71, 734.90 and 311.56 is: 429.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    532.71 : 734.90 = 311.56 : x
  2. Step 2: Convert to fraction form
    532.71/734.90 = 311.56/x
  3. Step 3: Cross multiply
    532.71x = 734.90 × 311.56
  4. Step 4: Simplify right side
    532.71x = 228,960.21
  5. Step 5: Solve for x
    x = 228,960.21/532.71
  6. Step 6: Final answer
    x = 429.81

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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.