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Finding the Fourth Proportional to 1,102.25, 1,653.37 and 858.95

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Solution

The fourth proportional to 1,102.25, 1,653.37 and 858.95 is: 1,288.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.25 : 1,653.37 = 858.95 : x
  2. Step 2: Convert to fraction form
    1,102.25/1,653.37 = 858.95/x
  3. Step 3: Cross multiply
    1,102.25x = 1,653.37 × 858.95
  4. Step 4: Simplify right side
    1,102.25x = 1,420,169.66
  5. Step 5: Solve for x
    x = 1,420,169.66/1,102.25
  6. Step 6: Final answer
    x = 1,288.43

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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.