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Finding the Fourth Proportional to 386.61, 535.75 and 379.32

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Solution

The fourth proportional to 386.61, 535.75 and 379.32 is: 525.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.61 : 535.75 = 379.32 : x
  2. Step 2: Convert to fraction form
    386.61/535.75 = 379.32/x
  3. Step 3: Cross multiply
    386.61x = 535.75 × 379.32
  4. Step 4: Simplify right side
    386.61x = 203,220.69
  5. Step 5: Solve for x
    x = 203,220.69/386.61
  6. Step 6: Final answer
    x = 525.65

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.