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Finding the Fourth Proportional to 1,078.09, 1,487.99 and 685.03

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Solution

The fourth proportional to 1,078.09, 1,487.99 and 685.03 is: 945.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.09 : 1,487.99 = 685.03 : x
  2. Step 2: Convert to fraction form
    1,078.09/1,487.99 = 685.03/x
  3. Step 3: Cross multiply
    1,078.09x = 1,487.99 × 685.03
  4. Step 4: Simplify right side
    1,078.09x = 1,019,323.22
  5. Step 5: Solve for x
    x = 1,019,323.22/1,078.09
  6. Step 6: Final answer
    x = 945.49

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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.