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Finding the Fourth Proportional to 299.78, 412.65 and 260.90

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Solution

The fourth proportional to 299.78, 412.65 and 260.90 is: 359.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.78 : 412.65 = 260.90 : x
  2. Step 2: Convert to fraction form
    299.78/412.65 = 260.90/x
  3. Step 3: Cross multiply
    299.78x = 412.65 × 260.90
  4. Step 4: Simplify right side
    299.78x = 107,660.39
  5. Step 5: Solve for x
    x = 107,660.39/299.78
  6. Step 6: Final answer
    x = 359.13

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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.