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Finding the Fourth Proportional to 622.55, 932.79 and 439.05

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Solution

The fourth proportional to 622.55, 932.79 and 439.05 is: 657.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.55 : 932.79 = 439.05 : x
  2. Step 2: Convert to fraction form
    622.55/932.79 = 439.05/x
  3. Step 3: Cross multiply
    622.55x = 932.79 × 439.05
  4. Step 4: Simplify right side
    622.55x = 409,541.45
  5. Step 5: Solve for x
    x = 409,541.45/622.55
  6. Step 6: Final answer
    x = 657.85

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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.