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Finding the Fourth Proportional to 1,317.59, 1,818.39 and 728.31

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Solution

The fourth proportional to 1,317.59, 1,818.39 and 728.31 is: 1,005.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.59 : 1,818.39 = 728.31 : x
  2. Step 2: Convert to fraction form
    1,317.59/1,818.39 = 728.31/x
  3. Step 3: Cross multiply
    1,317.59x = 1,818.39 × 728.31
  4. Step 4: Simplify right side
    1,317.59x = 1,324,351.62
  5. Step 5: Solve for x
    x = 1,324,351.62/1,317.59
  6. Step 6: Final answer
    x = 1,005.13

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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.