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Finding the Fourth Proportional to 628.64, 859.83 and 618.56

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Solution

The fourth proportional to 628.64, 859.83 and 618.56 is: 846.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.64 : 859.83 = 618.56 : x
  2. Step 2: Convert to fraction form
    628.64/859.83 = 618.56/x
  3. Step 3: Cross multiply
    628.64x = 859.83 × 618.56
  4. Step 4: Simplify right side
    628.64x = 531,856.44
  5. Step 5: Solve for x
    x = 531,856.44/628.64
  6. Step 6: Final answer
    x = 846.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.