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Finding the Fourth Proportional to 835.23, 1,149.92 and 687.60

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Solution

The fourth proportional to 835.23, 1,149.92 and 687.60 is: 946.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.23 : 1,149.92 = 687.60 : x
  2. Step 2: Convert to fraction form
    835.23/1,149.92 = 687.60/x
  3. Step 3: Cross multiply
    835.23x = 1,149.92 × 687.60
  4. Step 4: Simplify right side
    835.23x = 790,684.99
  5. Step 5: Solve for x
    x = 790,684.99/835.23
  6. Step 6: Final answer
    x = 946.67

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.