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Finding the Fourth Proportional to 622.88, 859.52 and 386.72

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Solution

The fourth proportional to 622.88, 859.52 and 386.72 is: 533.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.88 : 859.52 = 386.72 : x
  2. Step 2: Convert to fraction form
    622.88/859.52 = 386.72/x
  3. Step 3: Cross multiply
    622.88x = 859.52 × 386.72
  4. Step 4: Simplify right side
    622.88x = 332,393.57
  5. Step 5: Solve for x
    x = 332,393.57/622.88
  6. Step 6: Final answer
    x = 533.64

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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.