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Finding the Fourth Proportional to 309.80, 465.78 and 259.58

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Solution

The fourth proportional to 309.80, 465.78 and 259.58 is: 390.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.80 : 465.78 = 259.58 : x
  2. Step 2: Convert to fraction form
    309.80/465.78 = 259.58/x
  3. Step 3: Cross multiply
    309.80x = 465.78 × 259.58
  4. Step 4: Simplify right side
    309.80x = 120,907.17
  5. Step 5: Solve for x
    x = 120,907.17/309.80
  6. Step 6: Final answer
    x = 390.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.