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Finding the Fourth Proportional to 902.13, 1,245.54 and 553.42

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Solution

The fourth proportional to 902.13, 1,245.54 and 553.42 is: 764.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.13 : 1,245.54 = 553.42 : x
  2. Step 2: Convert to fraction form
    902.13/1,245.54 = 553.42/x
  3. Step 3: Cross multiply
    902.13x = 1,245.54 × 553.42
  4. Step 4: Simplify right side
    902.13x = 689,306.75
  5. Step 5: Solve for x
    x = 689,306.75/902.13
  6. Step 6: Final answer
    x = 764.09

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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.