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Finding the Fourth Proportional to 697.90, 963.20 and 399.24

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Solution

The fourth proportional to 697.90, 963.20 and 399.24 is: 551.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    697.90 : 963.20 = 399.24 : x
  2. Step 2: Convert to fraction form
    697.90/963.20 = 399.24/x
  3. Step 3: Cross multiply
    697.90x = 963.20 × 399.24
  4. Step 4: Simplify right side
    697.90x = 384,547.97
  5. Step 5: Solve for x
    x = 384,547.97/697.90
  6. Step 6: Final answer
    x = 551.01

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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.