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Finding the Fourth Proportional to 622.05, 931.32 and 328.89

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Solution

The fourth proportional to 622.05, 931.32 and 328.89 is: 492.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.05 : 931.32 = 328.89 : x
  2. Step 2: Convert to fraction form
    622.05/931.32 = 328.89/x
  3. Step 3: Cross multiply
    622.05x = 931.32 × 328.89
  4. Step 4: Simplify right side
    622.05x = 306,299.51
  5. Step 5: Solve for x
    x = 306,299.51/622.05
  6. Step 6: Final answer
    x = 492.40

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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.