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Finding the Fourth Proportional to 909.65, 1,255.23 and 516.67

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Solution

The fourth proportional to 909.65, 1,255.23 and 516.67 is: 712.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.65 : 1,255.23 = 516.67 : x
  2. Step 2: Convert to fraction form
    909.65/1,255.23 = 516.67/x
  3. Step 3: Cross multiply
    909.65x = 1,255.23 × 516.67
  4. Step 4: Simplify right side
    909.65x = 648,536.55
  5. Step 5: Solve for x
    x = 648,536.55/909.65
  6. Step 6: Final answer
    x = 712.95

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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.