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Finding the Fourth Proportional to 1,386.79, 2,078.67 and 684.48

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Solution

The fourth proportional to 1,386.79, 2,078.67 and 684.48 is: 1,025.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.79 : 2,078.67 = 684.48 : x
  2. Step 2: Convert to fraction form
    1,386.79/2,078.67 = 684.48/x
  3. Step 3: Cross multiply
    1,386.79x = 2,078.67 × 684.48
  4. Step 4: Simplify right side
    1,386.79x = 1,422,808.04
  5. Step 5: Solve for x
    x = 1,422,808.04/1,386.79
  6. Step 6: Final answer
    x = 1,025.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.