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Finding the Fourth Proportional to 693.88, 957.64 and 399.32

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Solution

The fourth proportional to 693.88, 957.64 and 399.32 is: 551.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.88 : 957.64 = 399.32 : x
  2. Step 2: Convert to fraction form
    693.88/957.64 = 399.32/x
  3. Step 3: Cross multiply
    693.88x = 957.64 × 399.32
  4. Step 4: Simplify right side
    693.88x = 382,404.80
  5. Step 5: Solve for x
    x = 382,404.80/693.88
  6. Step 6: Final answer
    x = 551.11

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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.