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Finding the Fourth Proportional to 829.41, 1,243.77 and 418.77

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Solution

The fourth proportional to 829.41, 1,243.77 and 418.77 is: 627.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.41 : 1,243.77 = 418.77 : x
  2. Step 2: Convert to fraction form
    829.41/1,243.77 = 418.77/x
  3. Step 3: Cross multiply
    829.41x = 1,243.77 × 418.77
  4. Step 4: Simplify right side
    829.41x = 520,853.56
  5. Step 5: Solve for x
    x = 520,853.56/829.41
  6. Step 6: Final answer
    x = 627.98

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1.5x scale

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.