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Finding the Fourth Proportional to 694, 957.72 and 399.30

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Solution

The fourth proportional to 694, 957.72 and 399.30 is: 551.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    694 : 957.72 = 399.30 : x
  2. Step 2: Convert to fraction form
    694/957.72 = 399.30/x
  3. Step 3: Cross multiply
    694x = 957.72 × 399.30
  4. Step 4: Simplify right side
    694x = 382,417.60
  5. Step 5: Solve for x
    x = 382,417.60/694
  6. Step 6: Final answer
    x = 551.03

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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.