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Finding the Fourth Proportional to 805.44, 1,206.50 and 387.74

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Solution

The fourth proportional to 805.44, 1,206.50 and 387.74 is: 580.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.44 : 1,206.50 = 387.74 : x
  2. Step 2: Convert to fraction form
    805.44/1,206.50 = 387.74/x
  3. Step 3: Cross multiply
    805.44x = 1,206.50 × 387.74
  4. Step 4: Simplify right side
    805.44x = 467,804.78
  5. Step 5: Solve for x
    x = 467,804.78/805.44
  6. Step 6: Final answer
    x = 580.80

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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.