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Finding the Fourth Proportional to 939.72, 1,408.14 and 425.64

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Solution

The fourth proportional to 939.72, 1,408.14 and 425.64 is: 637.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.72 : 1,408.14 = 425.64 : x
  2. Step 2: Convert to fraction form
    939.72/1,408.14 = 425.64/x
  3. Step 3: Cross multiply
    939.72x = 1,408.14 × 425.64
  4. Step 4: Simplify right side
    939.72x = 599,360.71
  5. Step 5: Solve for x
    x = 599,360.71/939.72
  6. Step 6: Final answer
    x = 637.81

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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.