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Finding the Fourth Proportional to 959.82, 1,439.72 and 310.55

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Solution

The fourth proportional to 959.82, 1,439.72 and 310.55 is: 465.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.82 : 1,439.72 = 310.55 : x
  2. Step 2: Convert to fraction form
    959.82/1,439.72 = 310.55/x
  3. Step 3: Cross multiply
    959.82x = 1,439.72 × 310.55
  4. Step 4: Simplify right side
    959.82x = 447,096.29
  5. Step 5: Solve for x
    x = 447,096.29/959.82
  6. Step 6: Final answer
    x = 465.81

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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.