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Finding the Fourth Proportional to 1,111.22, 1,534.21 and 858.68

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Solution

The fourth proportional to 1,111.22, 1,534.21 and 858.68 is: 1,185.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.22 : 1,534.21 = 858.68 : x
  2. Step 2: Convert to fraction form
    1,111.22/1,534.21 = 858.68/x
  3. Step 3: Cross multiply
    1,111.22x = 1,534.21 × 858.68
  4. Step 4: Simplify right side
    1,111.22x = 1,317,385.63
  5. Step 5: Solve for x
    x = 1,317,385.63/1,111.22
  6. Step 6: Final answer
    x = 1,185.54

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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.