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Finding the Fourth Proportional to 1,326.15, 1,989.90 and 546.73

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Solution

The fourth proportional to 1,326.15, 1,989.90 and 546.73 is: 820.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.15 : 1,989.90 = 546.73 : x
  2. Step 2: Convert to fraction form
    1,326.15/1,989.90 = 546.73/x
  3. Step 3: Cross multiply
    1,326.15x = 1,989.90 × 546.73
  4. Step 4: Simplify right side
    1,326.15x = 1,087,928.08
  5. Step 5: Solve for x
    x = 1,087,928.08/1,326.15
  6. Step 6: Final answer
    x = 820.37

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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.