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Finding the Fourth Proportional to 1,073.72, 1,482.20 and 811.80

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Solution

The fourth proportional to 1,073.72, 1,482.20 and 811.80 is: 1,120.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,073.72 : 1,482.20 = 811.80 : x
  2. Step 2: Convert to fraction form
    1,073.72/1,482.20 = 811.80/x
  3. Step 3: Cross multiply
    1,073.72x = 1,482.20 × 811.80
  4. Step 4: Simplify right side
    1,073.72x = 1,203,249.96
  5. Step 5: Solve for x
    x = 1,203,249.96/1,073.72
  6. Step 6: Final answer
    x = 1,120.64

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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.