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Finding the Fourth Proportional to 959.80, 1,437.30 and 767.80

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Solution

The fourth proportional to 959.80, 1,437.30 and 767.80 is: 1,149.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    959.80 : 1,437.30 = 767.80 : x
  2. Step 2: Convert to fraction form
    959.80/1,437.30 = 767.80/x
  3. Step 3: Cross multiply
    959.80x = 1,437.30 × 767.80
  4. Step 4: Simplify right side
    959.80x = 1,103,558.94
  5. Step 5: Solve for x
    x = 1,103,558.94/959.80
  6. Step 6: Final answer
    x = 1,149.78

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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.