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Finding the Fourth Proportional to 939.46, 1,408.84 and 322.99

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Solution

The fourth proportional to 939.46, 1,408.84 and 322.99 is: 484.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.46 : 1,408.84 = 322.99 : x
  2. Step 2: Convert to fraction form
    939.46/1,408.84 = 322.99/x
  3. Step 3: Cross multiply
    939.46x = 1,408.84 × 322.99
  4. Step 4: Simplify right side
    939.46x = 455,041.23
  5. Step 5: Solve for x
    x = 455,041.23/939.46
  6. Step 6: Final answer
    x = 484.36

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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.