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Finding the Fourth Proportional to 1,085.55, 1,627.91 and 857.13

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Solution

The fourth proportional to 1,085.55, 1,627.91 and 857.13 is: 1,285.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.55 : 1,627.91 = 857.13 : x
  2. Step 2: Convert to fraction form
    1,085.55/1,627.91 = 857.13/x
  3. Step 3: Cross multiply
    1,085.55x = 1,627.91 × 857.13
  4. Step 4: Simplify right side
    1,085.55x = 1,395,330.50
  5. Step 5: Solve for x
    x = 1,395,330.50/1,085.55
  6. Step 6: Final answer
    x = 1,285.37

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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.