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Finding the Fourth Proportional to 939.34, 1,408.86 and 591.61

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Solution

The fourth proportional to 939.34, 1,408.86 and 591.61 is: 887.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.34 : 1,408.86 = 591.61 : x
  2. Step 2: Convert to fraction form
    939.34/1,408.86 = 591.61/x
  3. Step 3: Cross multiply
    939.34x = 1,408.86 × 591.61
  4. Step 4: Simplify right side
    939.34x = 833,495.66
  5. Step 5: Solve for x
    x = 833,495.66/939.34
  6. Step 6: Final answer
    x = 887.32

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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.