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Finding the Fourth Proportional to 622.67, 859.35 and 386.55

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Solution

The fourth proportional to 622.67, 859.35 and 386.55 is: 533.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.67 : 859.35 = 386.55 : x
  2. Step 2: Convert to fraction form
    622.67/859.35 = 386.55/x
  3. Step 3: Cross multiply
    622.67x = 859.35 × 386.55
  4. Step 4: Simplify right side
    622.67x = 332,181.74
  5. Step 5: Solve for x
    x = 332,181.74/622.67
  6. Step 6: Final answer
    x = 533.48

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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.