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Finding the Fourth Proportional to 622.98, 859.52 and 386.87

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Solution

The fourth proportional to 622.98, 859.52 and 386.87 is: 533.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.98 : 859.52 = 386.87 : x
  2. Step 2: Convert to fraction form
    622.98/859.52 = 386.87/x
  3. Step 3: Cross multiply
    622.98x = 859.52 × 386.87
  4. Step 4: Simplify right side
    622.98x = 332,516.27
  5. Step 5: Solve for x
    x = 332,516.27/622.98
  6. Step 6: Final answer
    x = 533.75

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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.