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Finding the Fourth Proportional to 388.27, 535.08 and 309.34

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Solution

The fourth proportional to 388.27, 535.08 and 309.34 is: 426.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.27 : 535.08 = 309.34 : x
  2. Step 2: Convert to fraction form
    388.27/535.08 = 309.34/x
  3. Step 3: Cross multiply
    388.27x = 535.08 × 309.34
  4. Step 4: Simplify right side
    388.27x = 165,521.65
  5. Step 5: Solve for x
    x = 165,521.65/388.27
  6. Step 6: Final answer
    x = 426.31

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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.