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Finding the Fourth Proportional to 708.40, 1,057.46 and 622

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Solution

The fourth proportional to 708.40, 1,057.46 and 622 is: 928.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.40 : 1,057.46 = 622 : x
  2. Step 2: Convert to fraction form
    708.40/1,057.46 = 622/x
  3. Step 3: Cross multiply
    708.40x = 1,057.46 × 622
  4. Step 4: Simplify right side
    708.40x = 657,740.12
  5. Step 5: Solve for x
    x = 657,740.12/708.40
  6. Step 6: Final answer
    x = 928.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.