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Finding the Fourth Proportional to 388.63, 534.79 and 386.23

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Solution

The fourth proportional to 388.63, 534.79 and 386.23 is: 531.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.63 : 534.79 = 386.23 : x
  2. Step 2: Convert to fraction form
    388.63/534.79 = 386.23/x
  3. Step 3: Cross multiply
    388.63x = 534.79 × 386.23
  4. Step 4: Simplify right side
    388.63x = 206,550.01
  5. Step 5: Solve for x
    x = 206,550.01/388.63
  6. Step 6: Final answer
    x = 531.48

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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.