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Finding the Fourth Proportional to 902.78, 1,245.78 and 498.98

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Solution

The fourth proportional to 902.78, 1,245.78 and 498.98 is: 688.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.78 : 1,245.78 = 498.98 : x
  2. Step 2: Convert to fraction form
    902.78/1,245.78 = 498.98/x
  3. Step 3: Cross multiply
    902.78x = 1,245.78 × 498.98
  4. Step 4: Simplify right side
    902.78x = 621,619.30
  5. Step 5: Solve for x
    x = 621,619.30/902.78
  6. Step 6: Final answer
    x = 688.56

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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.