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Finding the Fourth Proportional to 938.30, 1,408.80 and 665.60

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Solution

The fourth proportional to 938.30, 1,408.80 and 665.60 is: 999.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.30 : 1,408.80 = 665.60 : x
  2. Step 2: Convert to fraction form
    938.30/1,408.80 = 665.60/x
  3. Step 3: Cross multiply
    938.30x = 1,408.80 × 665.60
  4. Step 4: Simplify right side
    938.30x = 937,697.28
  5. Step 5: Solve for x
    x = 937,697.28/938.30
  6. Step 6: Final answer
    x = 999.36

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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.