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Finding the Fourth Proportional to 939.95, 1,295.77 and 659.31

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Solution

The fourth proportional to 939.95, 1,295.77 and 659.31 is: 908.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.95 : 1,295.77 = 659.31 : x
  2. Step 2: Convert to fraction form
    939.95/1,295.77 = 659.31/x
  3. Step 3: Cross multiply
    939.95x = 1,295.77 × 659.31
  4. Step 4: Simplify right side
    939.95x = 854,314.12
  5. Step 5: Solve for x
    x = 854,314.12/939.95
  6. Step 6: Final answer
    x = 908.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.