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Finding the Fourth Proportional to 309.86, 427.98 and 260.98

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Solution

The fourth proportional to 309.86, 427.98 and 260.98 is: 360.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.86 : 427.98 = 260.98 : x
  2. Step 2: Convert to fraction form
    309.86/427.98 = 260.98/x
  3. Step 3: Cross multiply
    309.86x = 427.98 × 260.98
  4. Step 4: Simplify right side
    309.86x = 111,694.22
  5. Step 5: Solve for x
    x = 111,694.22/309.86
  6. Step 6: Final answer
    x = 360.47

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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.