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Finding the Fourth Proportional to 1,427.88, 2,143.65 and 779.07

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Solution

The fourth proportional to 1,427.88, 2,143.65 and 779.07 is: 1,169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,427.88 : 2,143.65 = 779.07 : x
  2. Step 2: Convert to fraction form
    1,427.88/2,143.65 = 779.07/x
  3. Step 3: Cross multiply
    1,427.88x = 2,143.65 × 779.07
  4. Step 4: Simplify right side
    1,427.88x = 1,670,053.41
  5. Step 5: Solve for x
    x = 1,670,053.41/1,427.88
  6. Step 6: Final answer
    x = 1,169.60

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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.