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Finding the Fourth Proportional to 1,004.19, 1,385.91 and 611.43

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Solution

The fourth proportional to 1,004.19, 1,385.91 and 611.43 is: 843.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.19 : 1,385.91 = 611.43 : x
  2. Step 2: Convert to fraction form
    1,004.19/1,385.91 = 611.43/x
  3. Step 3: Cross multiply
    1,004.19x = 1,385.91 × 611.43
  4. Step 4: Simplify right side
    1,004.19x = 847,386.95
  5. Step 5: Solve for x
    x = 847,386.95/1,004.19
  6. Step 6: Final answer
    x = 843.85

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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.