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Finding the Fourth Proportional to 1,326.07, 1,989.30 and 676.45

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Solution

The fourth proportional to 1,326.07, 1,989.30 and 676.45 is: 1,014.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.07 : 1,989.30 = 676.45 : x
  2. Step 2: Convert to fraction form
    1,326.07/1,989.30 = 676.45/x
  3. Step 3: Cross multiply
    1,326.07x = 1,989.30 × 676.45
  4. Step 4: Simplify right side
    1,326.07x = 1,345,652.04
  5. Step 5: Solve for x
    x = 1,345,652.04/1,326.07
  6. Step 6: Final answer
    x = 1,014.77

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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.