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Finding the Fourth Proportional to 999.68, 1,379.13 and 626.40

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Solution

The fourth proportional to 999.68, 1,379.13 and 626.40 is: 864.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.68 : 1,379.13 = 626.40 : x
  2. Step 2: Convert to fraction form
    999.68/1,379.13 = 626.40/x
  3. Step 3: Cross multiply
    999.68x = 1,379.13 × 626.40
  4. Step 4: Simplify right side
    999.68x = 863,884.68
  5. Step 5: Solve for x
    x = 863,884.68/999.68
  6. Step 6: Final answer
    x = 864.17

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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.