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Finding the Fourth Proportional to 939.19, 1,409 and 322.89

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Solution

The fourth proportional to 939.19, 1,409 and 322.89 is: 484.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.19 : 1,409 = 322.89 : x
  2. Step 2: Convert to fraction form
    939.19/1,409 = 322.89/x
  3. Step 3: Cross multiply
    939.19x = 1,409 × 322.89
  4. Step 4: Simplify right side
    939.19x = 454,952.01
  5. Step 5: Solve for x
    x = 454,952.01/939.19
  6. Step 6: Final answer
    x = 484.41

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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.