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Finding the Fourth Proportional to 386.86, 533.46 and 316.39

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Solution

The fourth proportional to 386.86, 533.46 and 316.39 is: 436.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.86 : 533.46 = 316.39 : x
  2. Step 2: Convert to fraction form
    386.86/533.46 = 316.39/x
  3. Step 3: Cross multiply
    386.86x = 533.46 × 316.39
  4. Step 4: Simplify right side
    386.86x = 168,781.41
  5. Step 5: Solve for x
    x = 168,781.41/386.86
  6. Step 6: Final answer
    x = 436.29

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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.