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Finding the Fourth Proportional to 999.62, 1,378.58 and 626.64

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Solution

The fourth proportional to 999.62, 1,378.58 and 626.64 is: 864.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.62 : 1,378.58 = 626.64 : x
  2. Step 2: Convert to fraction form
    999.62/1,378.58 = 626.64/x
  3. Step 3: Cross multiply
    999.62x = 1,378.58 × 626.64
  4. Step 4: Simplify right side
    999.62x = 863,870.24
  5. Step 5: Solve for x
    x = 863,870.24/999.62
  6. Step 6: Final answer
    x = 864.20

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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.