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Finding the Fourth Proportional to 939.26, 1,295.88 and 607.80

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Solution

The fourth proportional to 939.26, 1,295.88 and 607.80 is: 838.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.26 : 1,295.88 = 607.80 : x
  2. Step 2: Convert to fraction form
    939.26/1,295.88 = 607.80/x
  3. Step 3: Cross multiply
    939.26x = 1,295.88 × 607.80
  4. Step 4: Simplify right side
    939.26x = 787,635.86
  5. Step 5: Solve for x
    x = 787,635.86/939.26
  6. Step 6: Final answer
    x = 838.57

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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.