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Finding the Fourth Proportional to 939.60, 1,399.41 and 905.58

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Solution

The fourth proportional to 939.60, 1,399.41 and 905.58 is: 1,348.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.60 : 1,399.41 = 905.58 : x
  2. Step 2: Convert to fraction form
    939.60/1,399.41 = 905.58/x
  3. Step 3: Cross multiply
    939.60x = 1,399.41 × 905.58
  4. Step 4: Simplify right side
    939.60x = 1,267,277.71
  5. Step 5: Solve for x
    x = 1,267,277.71/939.60
  6. Step 6: Final answer
    x = 1,348.74

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.