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Finding the Fourth Proportional to 1,558.54, 2,150.85 and 859.96

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Solution

The fourth proportional to 1,558.54, 2,150.85 and 859.96 is: 1,186.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,558.54 : 2,150.85 = 859.96 : x
  2. Step 2: Convert to fraction form
    1,558.54/2,150.85 = 859.96/x
  3. Step 3: Cross multiply
    1,558.54x = 2,150.85 × 859.96
  4. Step 4: Simplify right side
    1,558.54x = 1,849,644.97
  5. Step 5: Solve for x
    x = 1,849,644.97/1,558.54
  6. Step 6: Final answer
    x = 1,186.78

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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.