Home / 1,215.27-1,821.65-666.30

Finding the Fourth Proportional to 1,215.27, 1,821.65 and 666.30

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Solution

The fourth proportional to 1,215.27, 1,821.65 and 666.30 is: 998.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.27 : 1,821.65 = 666.30 : x
  2. Step 2: Convert to fraction form
    1,215.27/1,821.65 = 666.30/x
  3. Step 3: Cross multiply
    1,215.27x = 1,821.65 × 666.30
  4. Step 4: Simplify right side
    1,215.27x = 1,213,765.40
  5. Step 5: Solve for x
    x = 1,213,765.40/1,215.27
  6. Step 6: Final answer
    x = 998.76

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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.