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Finding the Fourth Proportional to 1,073.95, 1,481.48 and 811.51

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Solution

The fourth proportional to 1,073.95, 1,481.48 and 811.51 is: 1,119.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.95 : 1,481.48 = 811.51 : x
  2. Step 2: Convert to fraction form
    1,073.95/1,481.48 = 811.51/x
  3. Step 3: Cross multiply
    1,073.95x = 1,481.48 × 811.51
  4. Step 4: Simplify right side
    1,073.95x = 1,202,235.83
  5. Step 5: Solve for x
    x = 1,202,235.83/1,073.95
  6. Step 6: Final answer
    x = 1,119.45

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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.