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Finding the Fourth Proportional to 1,004.73, 1,387.30 and 783.30

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Solution

The fourth proportional to 1,004.73, 1,387.30 and 783.30 is: 1,081.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.73 : 1,387.30 = 783.30 : x
  2. Step 2: Convert to fraction form
    1,004.73/1,387.30 = 783.30/x
  3. Step 3: Cross multiply
    1,004.73x = 1,387.30 × 783.30
  4. Step 4: Simplify right side
    1,004.73x = 1,086,672.09
  5. Step 5: Solve for x
    x = 1,086,672.09/1,004.73
  6. Step 6: Final answer
    x = 1,081.56

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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.