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Finding the Fourth Proportional to 399.90, 551.25 and 260

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Solution

The fourth proportional to 399.90, 551.25 and 260 is: 358.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.90 : 551.25 = 260 : x
  2. Step 2: Convert to fraction form
    399.90/551.25 = 260/x
  3. Step 3: Cross multiply
    399.90x = 551.25 × 260
  4. Step 4: Simplify right side
    399.90x = 143,325
  5. Step 5: Solve for x
    x = 143,325/399.90
  6. Step 6: Final answer
    x = 358.40

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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.