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Finding the Fourth Proportional to 999.26, 1,380.21 and 705.83

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Solution

The fourth proportional to 999.26, 1,380.21 and 705.83 is: 974.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.26 : 1,380.21 = 705.83 : x
  2. Step 2: Convert to fraction form
    999.26/1,380.21 = 705.83/x
  3. Step 3: Cross multiply
    999.26x = 1,380.21 × 705.83
  4. Step 4: Simplify right side
    999.26x = 974,197.07
  5. Step 5: Solve for x
    x = 974,197.07/999.26
  6. Step 6: Final answer
    x = 974.92

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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.