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Finding the Fourth Proportional to 305.49, 420.55 and 268.07

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Solution

The fourth proportional to 305.49, 420.55 and 268.07 is: 369.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.49 : 420.55 = 268.07 : x
  2. Step 2: Convert to fraction form
    305.49/420.55 = 268.07/x
  3. Step 3: Cross multiply
    305.49x = 420.55 × 268.07
  4. Step 4: Simplify right side
    305.49x = 112,734.07
  5. Step 5: Solve for x
    x = 112,734.07/305.49
  6. Step 6: Final answer
    x = 369.03

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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.