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Finding the Fourth Proportional to 1,326.67, 1,989.99 and 547.09

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Solution

The fourth proportional to 1,326.67, 1,989.99 and 547.09 is: 820.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.67 : 1,989.99 = 547.09 : x
  2. Step 2: Convert to fraction form
    1,326.67/1,989.99 = 547.09/x
  3. Step 3: Cross multiply
    1,326.67x = 1,989.99 × 547.09
  4. Step 4: Simplify right side
    1,326.67x = 1,088,703.63
  5. Step 5: Solve for x
    x = 1,088,703.63/1,326.67
  6. Step 6: Final answer
    x = 820.63

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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.