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Finding the Fourth Proportional to 505.94, 698.22 and 309.42

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Solution

The fourth proportional to 505.94, 698.22 and 309.42 is: 427.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.94 : 698.22 = 309.42 : x
  2. Step 2: Convert to fraction form
    505.94/698.22 = 309.42/x
  3. Step 3: Cross multiply
    505.94x = 698.22 × 309.42
  4. Step 4: Simplify right side
    505.94x = 216,043.23
  5. Step 5: Solve for x
    x = 216,043.23/505.94
  6. Step 6: Final answer
    x = 427.02

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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.