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Finding the Fourth Proportional to 903.58, 1,247.16 and 554.56

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Solution

The fourth proportional to 903.58, 1,247.16 and 554.56 is: 765.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.58 : 1,247.16 = 554.56 : x
  2. Step 2: Convert to fraction form
    903.58/1,247.16 = 554.56/x
  3. Step 3: Cross multiply
    903.58x = 1,247.16 × 554.56
  4. Step 4: Simplify right side
    903.58x = 691,625.05
  5. Step 5: Solve for x
    x = 691,625.05/903.58
  6. Step 6: Final answer
    x = 765.43

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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.