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Finding the Fourth Proportional to 1,842, 2,763.12 and 816

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Solution

The fourth proportional to 1,842, 2,763.12 and 816 is: 1,224.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,842 : 2,763.12 = 816 : x
  2. Step 2: Convert to fraction form
    1,842/2,763.12 = 816/x
  3. Step 3: Cross multiply
    1,842x = 2,763.12 × 816
  4. Step 4: Simplify right side
    1,842x = 2,254,705.92
  5. Step 5: Solve for x
    x = 2,254,705.92/1,842
  6. Step 6: Final answer
    x = 1,224.05

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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.