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Finding the Fourth Proportional to 786.34, 1,085.00 and 668.79

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Solution

The fourth proportional to 786.34, 1,085.00 and 668.79 is: 922.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.34 : 1,085.00 = 668.79 : x
  2. Step 2: Convert to fraction form
    786.34/1,085.00 = 668.79/x
  3. Step 3: Cross multiply
    786.34x = 1,085.00 × 668.79
  4. Step 4: Simplify right side
    786.34x = 725,633.81
  5. Step 5: Solve for x
    x = 725,633.81/786.34
  6. Step 6: Final answer
    x = 922.80

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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.