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Finding the Fourth Proportional to 800.67, 1,200.40 and 540.03

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Solution

The fourth proportional to 800.67, 1,200.40 and 540.03 is: 809.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.67 : 1,200.40 = 540.03 : x
  2. Step 2: Convert to fraction form
    800.67/1,200.40 = 540.03/x
  3. Step 3: Cross multiply
    800.67x = 1,200.40 × 540.03
  4. Step 4: Simplify right side
    800.67x = 648,252.01
  5. Step 5: Solve for x
    x = 648,252.01/800.67
  6. Step 6: Final answer
    x = 809.64

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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.