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Finding the Fourth Proportional to 939.40, 1,408.50 and 500.38

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Solution

The fourth proportional to 939.40, 1,408.50 and 500.38 is: 750.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.40 : 1,408.50 = 500.38 : x
  2. Step 2: Convert to fraction form
    939.40/1,408.50 = 500.38/x
  3. Step 3: Cross multiply
    939.40x = 1,408.50 × 500.38
  4. Step 4: Simplify right side
    939.40x = 704,785.23
  5. Step 5: Solve for x
    x = 704,785.23/939.40
  6. Step 6: Final answer
    x = 750.25

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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.