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Finding the Fourth Proportional to 918.53, 1,375.97 and 554.03

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Solution

The fourth proportional to 918.53, 1,375.97 and 554.03 is: 829.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.53 : 1,375.97 = 554.03 : x
  2. Step 2: Convert to fraction form
    918.53/1,375.97 = 554.03/x
  3. Step 3: Cross multiply
    918.53x = 1,375.97 × 554.03
  4. Step 4: Simplify right side
    918.53x = 762,333.48
  5. Step 5: Solve for x
    x = 762,333.48/918.53
  6. Step 6: Final answer
    x = 829.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.