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Finding the Fourth Proportional to 939.59, 1,409.08 and 391.48

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Solution

The fourth proportional to 939.59, 1,409.08 and 391.48 is: 587.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.59 : 1,409.08 = 391.48 : x
  2. Step 2: Convert to fraction form
    939.59/1,409.08 = 391.48/x
  3. Step 3: Cross multiply
    939.59x = 1,409.08 × 391.48
  4. Step 4: Simplify right side
    939.59x = 551,617.64
  5. Step 5: Solve for x
    x = 551,617.64/939.59
  6. Step 6: Final answer
    x = 587.09

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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.