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Finding the Fourth Proportional to 1,259.72, 1,739.22 and 811.79

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Solution

The fourth proportional to 1,259.72, 1,739.22 and 811.79 is: 1,120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.72 : 1,739.22 = 811.79 : x
  2. Step 2: Convert to fraction form
    1,259.72/1,739.22 = 811.79/x
  3. Step 3: Cross multiply
    1,259.72x = 1,739.22 × 811.79
  4. Step 4: Simplify right side
    1,259.72x = 1,411,872.71
  5. Step 5: Solve for x
    x = 1,411,872.71/1,259.72
  6. Step 6: Final answer
    x = 1,120.79

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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.