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Finding the Fourth Proportional to 939.04, 1,408.64 and 391.04

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Solution

The fourth proportional to 939.04, 1,408.64 and 391.04 is: 586.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.04 : 1,408.64 = 391.04 : x
  2. Step 2: Convert to fraction form
    939.04/1,408.64 = 391.04/x
  3. Step 3: Cross multiply
    939.04x = 1,408.64 × 391.04
  4. Step 4: Simplify right side
    939.04x = 550,834.59
  5. Step 5: Solve for x
    x = 550,834.59/939.04
  6. Step 6: Final answer
    x = 586.59

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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.