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Finding the Fourth Proportional to 693.69, 957.21 and 398.88

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Solution

The fourth proportional to 693.69, 957.21 and 398.88 is: 550.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.69 : 957.21 = 398.88 : x
  2. Step 2: Convert to fraction form
    693.69/957.21 = 398.88/x
  3. Step 3: Cross multiply
    693.69x = 957.21 × 398.88
  4. Step 4: Simplify right side
    693.69x = 381,811.92
  5. Step 5: Solve for x
    x = 381,811.92/693.69
  6. Step 6: Final answer
    x = 550.41

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.