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Finding the Fourth Proportional to 1,253.72, 1,879.54 and 790.36

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Solution

The fourth proportional to 1,253.72, 1,879.54 and 790.36 is: 1,184.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.72 : 1,879.54 = 790.36 : x
  2. Step 2: Convert to fraction form
    1,253.72/1,879.54 = 790.36/x
  3. Step 3: Cross multiply
    1,253.72x = 1,879.54 × 790.36
  4. Step 4: Simplify right side
    1,253.72x = 1,485,506.56
  5. Step 5: Solve for x
    x = 1,485,506.56/1,253.72
  6. Step 6: Final answer
    x = 1,184.88

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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.