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Finding the Fourth Proportional to 999.21, 1,378.58 and 626.07

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Solution

The fourth proportional to 999.21, 1,378.58 and 626.07 is: 863.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.21 : 1,378.58 = 626.07 : x
  2. Step 2: Convert to fraction form
    999.21/1,378.58 = 626.07/x
  3. Step 3: Cross multiply
    999.21x = 1,378.58 × 626.07
  4. Step 4: Simplify right side
    999.21x = 863,084.45
  5. Step 5: Solve for x
    x = 863,084.45/999.21
  6. Step 6: Final answer
    x = 863.77

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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.