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Finding the Fourth Proportional to 1,053.81, 1,580.31 and 728.19

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Solution

The fourth proportional to 1,053.81, 1,580.31 and 728.19 is: 1,092.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,053.81 : 1,580.31 = 728.19 : x
  2. Step 2: Convert to fraction form
    1,053.81/1,580.31 = 728.19/x
  3. Step 3: Cross multiply
    1,053.81x = 1,580.31 × 728.19
  4. Step 4: Simplify right side
    1,053.81x = 1,150,765.94
  5. Step 5: Solve for x
    x = 1,150,765.94/1,053.81
  6. Step 6: Final answer
    x = 1,092.01

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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.