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Finding the Fourth Proportional to 939.20, 1,408.80 and 322.93

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Solution

The fourth proportional to 939.20, 1,408.80 and 322.93 is: 484.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.20 : 1,408.80 = 322.93 : x
  2. Step 2: Convert to fraction form
    939.20/1,408.80 = 322.93/x
  3. Step 3: Cross multiply
    939.20x = 1,408.80 × 322.93
  4. Step 4: Simplify right side
    939.20x = 454,943.78
  5. Step 5: Solve for x
    x = 454,943.78/939.20
  6. Step 6: Final answer
    x = 484.40

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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.