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Finding the Fourth Proportional to 1,369.24, 1,889.63 and 779.79

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Solution

The fourth proportional to 1,369.24, 1,889.63 and 779.79 is: 1,076.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.24 : 1,889.63 = 779.79 : x
  2. Step 2: Convert to fraction form
    1,369.24/1,889.63 = 779.79/x
  3. Step 3: Cross multiply
    1,369.24x = 1,889.63 × 779.79
  4. Step 4: Simplify right side
    1,369.24x = 1,473,520.69
  5. Step 5: Solve for x
    x = 1,473,520.69/1,369.24
  6. Step 6: Final answer
    x = 1,076.16

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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.