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Finding the Fourth Proportional to 622.48, 859.14 and 389.56

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Solution

The fourth proportional to 622.48, 859.14 and 389.56 is: 537.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.48 : 859.14 = 389.56 : x
  2. Step 2: Convert to fraction form
    622.48/859.14 = 389.56/x
  3. Step 3: Cross multiply
    622.48x = 859.14 × 389.56
  4. Step 4: Simplify right side
    622.48x = 334,686.58
  5. Step 5: Solve for x
    x = 334,686.58/622.48
  6. Step 6: Final answer
    x = 537.67

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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.