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Finding the Fourth Proportional to 1,317.78, 1,818.41 and 728.30

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Solution

The fourth proportional to 1,317.78, 1,818.41 and 728.30 is: 1,004.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.78 : 1,818.41 = 728.30 : x
  2. Step 2: Convert to fraction form
    1,317.78/1,818.41 = 728.30/x
  3. Step 3: Cross multiply
    1,317.78x = 1,818.41 × 728.30
  4. Step 4: Simplify right side
    1,317.78x = 1,324,348.00
  5. Step 5: Solve for x
    x = 1,324,348.00/1,317.78
  6. Step 6: Final answer
    x = 1,004.98

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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.