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Finding the Fourth Proportional to 959.40, 1,440.30 and 636.84

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Solution

The fourth proportional to 959.40, 1,440.30 and 636.84 is: 956.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.40 : 1,440.30 = 636.84 : x
  2. Step 2: Convert to fraction form
    959.40/1,440.30 = 636.84/x
  3. Step 3: Cross multiply
    959.40x = 1,440.30 × 636.84
  4. Step 4: Simplify right side
    959.40x = 917,240.65
  5. Step 5: Solve for x
    x = 917,240.65/959.40
  6. Step 6: Final answer
    x = 956.06

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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.