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Finding the Fourth Proportional to 939.48, 1,408.71 and 666.11

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Solution

The fourth proportional to 939.48, 1,408.71 and 666.11 is: 998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.48 : 1,408.71 = 666.11 : x
  2. Step 2: Convert to fraction form
    939.48/1,408.71 = 666.11/x
  3. Step 3: Cross multiply
    939.48x = 1,408.71 × 666.11
  4. Step 4: Simplify right side
    939.48x = 938,355.82
  5. Step 5: Solve for x
    x = 938,355.82/939.48
  6. Step 6: Final answer
    x = 998.80

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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.