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Finding the Fourth Proportional to 999.19, 1,378.37 and 626.59

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Solution

The fourth proportional to 999.19, 1,378.37 and 626.59 is: 864.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.19 : 1,378.37 = 626.59 : x
  2. Step 2: Convert to fraction form
    999.19/1,378.37 = 626.59/x
  3. Step 3: Cross multiply
    999.19x = 1,378.37 × 626.59
  4. Step 4: Simplify right side
    999.19x = 863,669.73
  5. Step 5: Solve for x
    x = 863,669.73/999.19
  6. Step 6: Final answer
    x = 864.37

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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.