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Finding the Fourth Proportional to 1,121.54, 1,681.48 and 544

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Solution

The fourth proportional to 1,121.54, 1,681.48 and 544 is: 815.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.54 : 1,681.48 = 544 : x
  2. Step 2: Convert to fraction form
    1,121.54/1,681.48 = 544/x
  3. Step 3: Cross multiply
    1,121.54x = 1,681.48 × 544
  4. Step 4: Simplify right side
    1,121.54x = 914,725.12
  5. Step 5: Solve for x
    x = 914,725.12/1,121.54
  6. Step 6: Final answer
    x = 815.60

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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.