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Finding the Fourth Proportional to 309.63, 427.50 and 254.55

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Solution

The fourth proportional to 309.63, 427.50 and 254.55 is: 351.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.63 : 427.50 = 254.55 : x
  2. Step 2: Convert to fraction form
    309.63/427.50 = 254.55/x
  3. Step 3: Cross multiply
    309.63x = 427.50 × 254.55
  4. Step 4: Simplify right side
    309.63x = 108,820.13
  5. Step 5: Solve for x
    x = 108,820.13/309.63
  6. Step 6: Final answer
    x = 351.45

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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.