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Finding the Fourth Proportional to 939.35, 1,409.18 and 391.56

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Solution

The fourth proportional to 939.35, 1,409.18 and 391.56 is: 587.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.35 : 1,409.18 = 391.56 : x
  2. Step 2: Convert to fraction form
    939.35/1,409.18 = 391.56/x
  3. Step 3: Cross multiply
    939.35x = 1,409.18 × 391.56
  4. Step 4: Simplify right side
    939.35x = 551,778.52
  5. Step 5: Solve for x
    x = 551,778.52/939.35
  6. Step 6: Final answer
    x = 587.40

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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.