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Finding the Fourth Proportional to 872.89, 1,204.49 and 518.69

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Solution

The fourth proportional to 872.89, 1,204.49 and 518.69 is: 715.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.89 : 1,204.49 = 518.69 : x
  2. Step 2: Convert to fraction form
    872.89/1,204.49 = 518.69/x
  3. Step 3: Cross multiply
    872.89x = 1,204.49 × 518.69
  4. Step 4: Simplify right side
    872.89x = 624,756.92
  5. Step 5: Solve for x
    x = 624,756.92/872.89
  6. Step 6: Final answer
    x = 715.73

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Double scale
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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.