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Finding the Fourth Proportional to 789.45, 1,089.72 and 541.59

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Solution

The fourth proportional to 789.45, 1,089.72 and 541.59 is: 747.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.45 : 1,089.72 = 541.59 : x
  2. Step 2: Convert to fraction form
    789.45/1,089.72 = 541.59/x
  3. Step 3: Cross multiply
    789.45x = 1,089.72 × 541.59
  4. Step 4: Simplify right side
    789.45x = 590,179.42
  5. Step 5: Solve for x
    x = 590,179.42/789.45
  6. Step 6: Final answer
    x = 747.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.