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Finding the Fourth Proportional to 829.36, 1,243.23 and 342.55

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Solution

The fourth proportional to 829.36, 1,243.23 and 342.55 is: 513.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.36 : 1,243.23 = 342.55 : x
  2. Step 2: Convert to fraction form
    829.36/1,243.23 = 342.55/x
  3. Step 3: Cross multiply
    829.36x = 1,243.23 × 342.55
  4. Step 4: Simplify right side
    829.36x = 425,868.44
  5. Step 5: Solve for x
    x = 425,868.44/829.36
  6. Step 6: Final answer
    x = 513.49

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Double scale
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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.