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Finding the Fourth Proportional to 309.61, 427.10 and 178.53

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Solution

The fourth proportional to 309.61, 427.10 and 178.53 is: 246.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.61 : 427.10 = 178.53 : x
  2. Step 2: Convert to fraction form
    309.61/427.10 = 178.53/x
  3. Step 3: Cross multiply
    309.61x = 427.10 × 178.53
  4. Step 4: Simplify right side
    309.61x = 76,250.16
  5. Step 5: Solve for x
    x = 76,250.16/309.61
  6. Step 6: Final answer
    x = 246.28

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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.