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Finding the Fourth Proportional to 693.96, 957.90 and 399.24

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Solution

The fourth proportional to 693.96, 957.90 and 399.24 is: 551.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.96 : 957.90 = 399.24 : x
  2. Step 2: Convert to fraction form
    693.96/957.90 = 399.24/x
  3. Step 3: Cross multiply
    693.96x = 957.90 × 399.24
  4. Step 4: Simplify right side
    693.96x = 382,432.00
  5. Step 5: Solve for x
    x = 382,432.00/693.96
  6. Step 6: Final answer
    x = 551.09

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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.