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Finding the Fourth Proportional to 1,290.14, 1,935 and 826.55

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Solution

The fourth proportional to 1,290.14, 1,935 and 826.55 is: 1,239.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.14 : 1,935 = 826.55 : x
  2. Step 2: Convert to fraction form
    1,290.14/1,935 = 826.55/x
  3. Step 3: Cross multiply
    1,290.14x = 1,935 × 826.55
  4. Step 4: Simplify right side
    1,290.14x = 1,599,364.58
  5. Step 5: Solve for x
    x = 1,599,364.58/1,290.14
  6. Step 6: Final answer
    x = 1,239.69

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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.