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Finding the Fourth Proportional to 310.87, 466.31 and 139.67

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Solution

The fourth proportional to 310.87, 466.31 and 139.67 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.87 : 466.31 = 139.67 : x
  2. Step 2: Convert to fraction form
    310.87/466.31 = 139.67/x
  3. Step 3: Cross multiply
    310.87x = 466.31 × 139.67
  4. Step 4: Simplify right side
    310.87x = 65,128.82
  5. Step 5: Solve for x
    x = 65,128.82/310.87
  6. Step 6: Final answer
    x = 209.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.