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Finding the Fourth Proportional to 959.40, 1,439.30 and 310.58

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Solution

The fourth proportional to 959.40, 1,439.30 and 310.58 is: 465.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,439.30 = 310.58 : x
  2. Step 2: Convert to fraction form
    959.40/1,439.30 = 310.58/x
  3. Step 3: Cross multiply
    959.40x = 1,439.30 × 310.58
  4. Step 4: Simplify right side
    959.40x = 447,017.79
  5. Step 5: Solve for x
    x = 447,017.79/959.40
  6. Step 6: Final answer
    x = 465.93

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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.