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Finding the Fourth Proportional to 786.66, 1,083.12 and 668.40

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Solution

The fourth proportional to 786.66, 1,083.12 and 668.40 is: 920.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.66 : 1,083.12 = 668.40 : x
  2. Step 2: Convert to fraction form
    786.66/1,083.12 = 668.40/x
  3. Step 3: Cross multiply
    786.66x = 1,083.12 × 668.40
  4. Step 4: Simplify right side
    786.66x = 723,957.41
  5. Step 5: Solve for x
    x = 723,957.41/786.66
  6. Step 6: Final answer
    x = 920.29

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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.