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Finding the Fourth Proportional to 1,821.12, 2,731.80 and 666.56

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Solution

The fourth proportional to 1,821.12, 2,731.80 and 666.56 is: 999.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.12 : 2,731.80 = 666.56 : x
  2. Step 2: Convert to fraction form
    1,821.12/2,731.80 = 666.56/x
  3. Step 3: Cross multiply
    1,821.12x = 2,731.80 × 666.56
  4. Step 4: Simplify right side
    1,821.12x = 1,820,908.61
  5. Step 5: Solve for x
    x = 1,820,908.61/1,821.12
  6. Step 6: Final answer
    x = 999.88

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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.