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Finding the Fourth Proportional to 1,129.23, 1,558.32 and 687.27

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Solution

The fourth proportional to 1,129.23, 1,558.32 and 687.27 is: 948.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.23 : 1,558.32 = 687.27 : x
  2. Step 2: Convert to fraction form
    1,129.23/1,558.32 = 687.27/x
  3. Step 3: Cross multiply
    1,129.23x = 1,558.32 × 687.27
  4. Step 4: Simplify right side
    1,129.23x = 1,070,993.72
  5. Step 5: Solve for x
    x = 1,070,993.72/1,129.23
  6. Step 6: Final answer
    x = 948.43

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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.