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Finding the Fourth Proportional to 999.95, 1,379.23 and 685.46

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Solution

The fourth proportional to 999.95, 1,379.23 and 685.46 is: 945.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.95 : 1,379.23 = 685.46 : x
  2. Step 2: Convert to fraction form
    999.95/1,379.23 = 685.46/x
  3. Step 3: Cross multiply
    999.95x = 1,379.23 × 685.46
  4. Step 4: Simplify right side
    999.95x = 945,408.73
  5. Step 5: Solve for x
    x = 945,408.73/999.95
  6. Step 6: Final answer
    x = 945.46

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1.5x scale

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.