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Finding the Fourth Proportional to 399.87, 551.60 and 259.79

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Solution

The fourth proportional to 399.87, 551.60 and 259.79 is: 358.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.87 : 551.60 = 259.79 : x
  2. Step 2: Convert to fraction form
    399.87/551.60 = 259.79/x
  3. Step 3: Cross multiply
    399.87x = 551.60 × 259.79
  4. Step 4: Simplify right side
    399.87x = 143,300.16
  5. Step 5: Solve for x
    x = 143,300.16/399.87
  6. Step 6: Final answer
    x = 358.37

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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.