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Finding the Fourth Proportional to 1,518.12, 2,095.08 and 855

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Solution

The fourth proportional to 1,518.12, 2,095.08 and 855 is: 1,179.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.12 : 2,095.08 = 855 : x
  2. Step 2: Convert to fraction form
    1,518.12/2,095.08 = 855/x
  3. Step 3: Cross multiply
    1,518.12x = 2,095.08 × 855
  4. Step 4: Simplify right side
    1,518.12x = 1,791,293.40
  5. Step 5: Solve for x
    x = 1,791,293.40/1,518.12
  6. Step 6: Final answer
    x = 1,179.94

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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.