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Finding the Fourth Proportional to 829.76, 1,243.08 and 418.88

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Solution

The fourth proportional to 829.76, 1,243.08 and 418.88 is: 627.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.76 : 1,243.08 = 418.88 : x
  2. Step 2: Convert to fraction form
    829.76/1,243.08 = 418.88/x
  3. Step 3: Cross multiply
    829.76x = 1,243.08 × 418.88
  4. Step 4: Simplify right side
    829.76x = 520,701.35
  5. Step 5: Solve for x
    x = 520,701.35/829.76
  6. Step 6: Final answer
    x = 627.53

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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.