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Finding the Fourth Proportional to 804.98, 1,111.05 and 490.35

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Solution

The fourth proportional to 804.98, 1,111.05 and 490.35 is: 676.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.98 : 1,111.05 = 490.35 : x
  2. Step 2: Convert to fraction form
    804.98/1,111.05 = 490.35/x
  3. Step 3: Cross multiply
    804.98x = 1,111.05 × 490.35
  4. Step 4: Simplify right side
    804.98x = 544,803.37
  5. Step 5: Solve for x
    x = 544,803.37/804.98
  6. Step 6: Final answer
    x = 676.79

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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.