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Finding the Fourth Proportional to 1,077.12, 1,486.30 and 611.32

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Solution

The fourth proportional to 1,077.12, 1,486.30 and 611.32 is: 843.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,077.12 : 1,486.30 = 611.32 : x
  2. Step 2: Convert to fraction form
    1,077.12/1,486.30 = 611.32/x
  3. Step 3: Cross multiply
    1,077.12x = 1,486.30 × 611.32
  4. Step 4: Simplify right side
    1,077.12x = 908,604.92
  5. Step 5: Solve for x
    x = 908,604.92/1,077.12
  6. Step 6: Final answer
    x = 843.55

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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.