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Finding the Fourth Proportional to 309.86, 427.26 and 242.24

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Solution

The fourth proportional to 309.86, 427.26 and 242.24 is: 334.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.86 : 427.26 = 242.24 : x
  2. Step 2: Convert to fraction form
    309.86/427.26 = 242.24/x
  3. Step 3: Cross multiply
    309.86x = 427.26 × 242.24
  4. Step 4: Simplify right side
    309.86x = 103,499.46
  5. Step 5: Solve for x
    x = 103,499.46/309.86
  6. Step 6: Final answer
    x = 334.02

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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.