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Finding the Fourth Proportional to 622.95, 859.31 and 389.67

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Solution

The fourth proportional to 622.95, 859.31 and 389.67 is: 537.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.95 : 859.31 = 389.67 : x
  2. Step 2: Convert to fraction form
    622.95/859.31 = 389.67/x
  3. Step 3: Cross multiply
    622.95x = 859.31 × 389.67
  4. Step 4: Simplify right side
    622.95x = 334,842.06
  5. Step 5: Solve for x
    x = 334,842.06/622.95
  6. Step 6: Final answer
    x = 537.51

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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.