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Finding the Fourth Proportional to 800.83, 1,200.64 and 540.09

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Solution

The fourth proportional to 800.83, 1,200.64 and 540.09 is: 809.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    800.83 : 1,200.64 = 540.09 : x
  2. Step 2: Convert to fraction form
    800.83/1,200.64 = 540.09/x
  3. Step 3: Cross multiply
    800.83x = 1,200.64 × 540.09
  4. Step 4: Simplify right side
    800.83x = 648,460.37
  5. Step 5: Solve for x
    x = 648,460.37/800.83
  6. Step 6: Final answer
    x = 809.74

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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.