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Finding the Fourth Proportional to 863.82, 1,192.38 and 666.99

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Solution

The fourth proportional to 863.82, 1,192.38 and 666.99 is: 920.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.82 : 1,192.38 = 666.99 : x
  2. Step 2: Convert to fraction form
    863.82/1,192.38 = 666.99/x
  3. Step 3: Cross multiply
    863.82x = 1,192.38 × 666.99
  4. Step 4: Simplify right side
    863.82x = 795,305.54
  5. Step 5: Solve for x
    x = 795,305.54/863.82
  6. Step 6: Final answer
    x = 920.68

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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.