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Finding the Fourth Proportional to 999.15, 1,383.44 and 979.95

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Solution

The fourth proportional to 999.15, 1,383.44 and 979.95 is: 1,356.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.15 : 1,383.44 = 979.95 : x
  2. Step 2: Convert to fraction form
    999.15/1,383.44 = 979.95/x
  3. Step 3: Cross multiply
    999.15x = 1,383.44 × 979.95
  4. Step 4: Simplify right side
    999.15x = 1,355,697.13
  5. Step 5: Solve for x
    x = 1,355,697.13/999.15
  6. Step 6: Final answer
    x = 1,356.85

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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.