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Finding the Fourth Proportional to 826.36, 1,240.15 and 665.98

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Solution

The fourth proportional to 826.36, 1,240.15 and 665.98 is: 999.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.36 : 1,240.15 = 665.98 : x
  2. Step 2: Convert to fraction form
    826.36/1,240.15 = 665.98/x
  3. Step 3: Cross multiply
    826.36x = 1,240.15 × 665.98
  4. Step 4: Simplify right side
    826.36x = 825,915.10
  5. Step 5: Solve for x
    x = 825,915.10/826.36
  6. Step 6: Final answer
    x = 999.46

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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.