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Finding the Fourth Proportional to 309.60, 427.38 and 193.20

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Solution

The fourth proportional to 309.60, 427.38 and 193.20 is: 266.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.60 : 427.38 = 193.20 : x
  2. Step 2: Convert to fraction form
    309.60/427.38 = 193.20/x
  3. Step 3: Cross multiply
    309.60x = 427.38 × 193.20
  4. Step 4: Simplify right side
    309.60x = 82,569.82
  5. Step 5: Solve for x
    x = 82,569.82/309.60
  6. Step 6: Final answer
    x = 266.70

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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.