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Finding the Fourth Proportional to 305.86, 422.40 and 248.08

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Solution

The fourth proportional to 305.86, 422.40 and 248.08 is: 342.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.86 : 422.40 = 248.08 : x
  2. Step 2: Convert to fraction form
    305.86/422.40 = 248.08/x
  3. Step 3: Cross multiply
    305.86x = 422.40 × 248.08
  4. Step 4: Simplify right side
    305.86x = 104,788.99
  5. Step 5: Solve for x
    x = 104,788.99/305.86
  6. Step 6: Final answer
    x = 342.60

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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.