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Finding the Fourth Proportional to 803.58, 1,205.39 and 255.77

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Solution

The fourth proportional to 803.58, 1,205.39 and 255.77 is: 383.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.58 : 1,205.39 = 255.77 : x
  2. Step 2: Convert to fraction form
    803.58/1,205.39 = 255.77/x
  3. Step 3: Cross multiply
    803.58x = 1,205.39 × 255.77
  4. Step 4: Simplify right side
    803.58x = 308,301.32
  5. Step 5: Solve for x
    x = 308,301.32/803.58
  6. Step 6: Final answer
    x = 383.66

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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.