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Finding the Fourth Proportional to 628.21, 867.61 and 559.51

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Solution

The fourth proportional to 628.21, 867.61 and 559.51 is: 772.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.21 : 867.61 = 559.51 : x
  2. Step 2: Convert to fraction form
    628.21/867.61 = 559.51/x
  3. Step 3: Cross multiply
    628.21x = 867.61 × 559.51
  4. Step 4: Simplify right side
    628.21x = 485,435.00
  5. Step 5: Solve for x
    x = 485,435.00/628.21
  6. Step 6: Final answer
    x = 772.73

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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.