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Finding the Fourth Proportional to 693.90, 957.48 and 399.18

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Solution

The fourth proportional to 693.90, 957.48 and 399.18 is: 550.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.90 : 957.48 = 399.18 : x
  2. Step 2: Convert to fraction form
    693.90/957.48 = 399.18/x
  3. Step 3: Cross multiply
    693.90x = 957.48 × 399.18
  4. Step 4: Simplify right side
    693.90x = 382,206.87
  5. Step 5: Solve for x
    x = 382,206.87/693.90
  6. Step 6: Final answer
    x = 550.81

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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.