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Finding the Fourth Proportional to 1,008.90, 1,511.82 and 855.18

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Solution

The fourth proportional to 1,008.90, 1,511.82 and 855.18 is: 1,281.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.90 : 1,511.82 = 855.18 : x
  2. Step 2: Convert to fraction form
    1,008.90/1,511.82 = 855.18/x
  3. Step 3: Cross multiply
    1,008.90x = 1,511.82 × 855.18
  4. Step 4: Simplify right side
    1,008.90x = 1,292,878.23
  5. Step 5: Solve for x
    x = 1,292,878.23/1,008.90
  6. Step 6: Final answer
    x = 1,281.47

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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.