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Finding the Fourth Proportional to 902.79, 1,245.87 and 553.50

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Solution

The fourth proportional to 902.79, 1,245.87 and 553.50 is: 763.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.79 : 1,245.87 = 553.50 : x
  2. Step 2: Convert to fraction form
    902.79/1,245.87 = 553.50/x
  3. Step 3: Cross multiply
    902.79x = 1,245.87 × 553.50
  4. Step 4: Simplify right side
    902.79x = 689,589.05
  5. Step 5: Solve for x
    x = 689,589.05/902.79
  6. Step 6: Final answer
    x = 763.84

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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.