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Finding the Fourth Proportional to 1,228.59, 1,843.70 and 987.21

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Solution

The fourth proportional to 1,228.59, 1,843.70 and 987.21 is: 1,481.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.59 : 1,843.70 = 987.21 : x
  2. Step 2: Convert to fraction form
    1,228.59/1,843.70 = 987.21/x
  3. Step 3: Cross multiply
    1,228.59x = 1,843.70 × 987.21
  4. Step 4: Simplify right side
    1,228.59x = 1,820,114.14
  5. Step 5: Solve for x
    x = 1,820,114.14/1,228.59
  6. Step 6: Final answer
    x = 1,481.47

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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.