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Finding the Fourth Proportional to 2,681.67, 4,021.56 and 807

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Solution

The fourth proportional to 2,681.67, 4,021.56 and 807 is: 1,210.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,681.67 : 4,021.56 = 807 : x
  2. Step 2: Convert to fraction form
    2,681.67/4,021.56 = 807/x
  3. Step 3: Cross multiply
    2,681.67x = 4,021.56 × 807
  4. Step 4: Simplify right side
    2,681.67x = 3,245,398.92
  5. Step 5: Solve for x
    x = 3,245,398.92/2,681.67
  6. Step 6: Final answer
    x = 1,210.22

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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.