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Finding the Fourth Proportional to 1,820.80, 2,731.68 and 943.80

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Solution

The fourth proportional to 1,820.80, 2,731.68 and 943.80 is: 1,415.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,820.80 : 2,731.68 = 943.80 : x
  2. Step 2: Convert to fraction form
    1,820.80/2,731.68 = 943.80/x
  3. Step 3: Cross multiply
    1,820.80x = 2,731.68 × 943.80
  4. Step 4: Simplify right side
    1,820.80x = 2,578,159.58
  5. Step 5: Solve for x
    x = 2,578,159.58/1,820.80
  6. Step 6: Final answer
    x = 1,415.95

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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.