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Finding the Fourth Proportional to 1,288.48, 1,779.48 and 1,042.48

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Solution

The fourth proportional to 1,288.48, 1,779.48 and 1,042.48 is: 1,439.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.48 : 1,779.48 = 1,042.48 : x
  2. Step 2: Convert to fraction form
    1,288.48/1,779.48 = 1,042.48/x
  3. Step 3: Cross multiply
    1,288.48x = 1,779.48 × 1,042.48
  4. Step 4: Simplify right side
    1,288.48x = 1,855,072.31
  5. Step 5: Solve for x
    x = 1,855,072.31/1,288.48
  6. Step 6: Final answer
    x = 1,439.74

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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.