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Finding the Fourth Proportional to 903.85, 1,247.28 and 554.55

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Solution

The fourth proportional to 903.85, 1,247.28 and 554.55 is: 765.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.85 : 1,247.28 = 554.55 : x
  2. Step 2: Convert to fraction form
    903.85/1,247.28 = 554.55/x
  3. Step 3: Cross multiply
    903.85x = 1,247.28 × 554.55
  4. Step 4: Simplify right side
    903.85x = 691,679.12
  5. Step 5: Solve for x
    x = 691,679.12/903.85
  6. Step 6: Final answer
    x = 765.26

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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.