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Finding the Fourth Proportional to 959.28, 1,439 and 310.12

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Solution

The fourth proportional to 959.28, 1,439 and 310.12 is: 465.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.28 : 1,439 = 310.12 : x
  2. Step 2: Convert to fraction form
    959.28/1,439 = 310.12/x
  3. Step 3: Cross multiply
    959.28x = 1,439 × 310.12
  4. Step 4: Simplify right side
    959.28x = 446,262.68
  5. Step 5: Solve for x
    x = 446,262.68/959.28
  6. Step 6: Final answer
    x = 465.21

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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.