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Finding the Fourth Proportional to 693.56, 957.05 and 398.87

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Solution

The fourth proportional to 693.56, 957.05 and 398.87 is: 550.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.56 : 957.05 = 398.87 : x
  2. Step 2: Convert to fraction form
    693.56/957.05 = 398.87/x
  3. Step 3: Cross multiply
    693.56x = 957.05 × 398.87
  4. Step 4: Simplify right side
    693.56x = 381,738.93
  5. Step 5: Solve for x
    x = 381,738.93/693.56
  6. Step 6: Final answer
    x = 550.40

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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.