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Finding the Fourth Proportional to 1,055.78, 1,584.12 and 439.94

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Solution

The fourth proportional to 1,055.78, 1,584.12 and 439.94 is: 660.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055.78 : 1,584.12 = 439.94 : x
  2. Step 2: Convert to fraction form
    1,055.78/1,584.12 = 439.94/x
  3. Step 3: Cross multiply
    1,055.78x = 1,584.12 × 439.94
  4. Step 4: Simplify right side
    1,055.78x = 696,917.75
  5. Step 5: Solve for x
    x = 696,917.75/1,055.78
  6. Step 6: Final answer
    x = 660.10

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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.