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Finding the Fourth Proportional to 386.15, 531.80 and 351.55

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Solution

The fourth proportional to 386.15, 531.80 and 351.55 is: 484.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.15 : 531.80 = 351.55 : x
  2. Step 2: Convert to fraction form
    386.15/531.80 = 351.55/x
  3. Step 3: Cross multiply
    386.15x = 531.80 × 351.55
  4. Step 4: Simplify right side
    386.15x = 186,956.75
  5. Step 5: Solve for x
    x = 186,956.75/386.15
  6. Step 6: Final answer
    x = 484.15

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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.