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Finding the Fourth Proportional to 1,012.40, 1,519.20 and 666.73

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Solution

The fourth proportional to 1,012.40, 1,519.20 and 666.73 is: 1,000.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.40 : 1,519.20 = 666.73 : x
  2. Step 2: Convert to fraction form
    1,012.40/1,519.20 = 666.73/x
  3. Step 3: Cross multiply
    1,012.40x = 1,519.20 × 666.73
  4. Step 4: Simplify right side
    1,012.40x = 1,012,896.22
  5. Step 5: Solve for x
    x = 1,012,896.22/1,012.40
  6. Step 6: Final answer
    x = 1,000.49

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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.