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Finding the Fourth Proportional to 1,245.12, 1,866.24 and 660.69

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Solution

The fourth proportional to 1,245.12, 1,866.24 and 660.69 is: 990.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.12 : 1,866.24 = 660.69 : x
  2. Step 2: Convert to fraction form
    1,245.12/1,866.24 = 660.69/x
  3. Step 3: Cross multiply
    1,245.12x = 1,866.24 × 660.69
  4. Step 4: Simplify right side
    1,245.12x = 1,233,006.11
  5. Step 5: Solve for x
    x = 1,233,006.11/1,245.12
  6. Step 6: Final answer
    x = 990.27

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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.