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Finding the Fourth Proportional to 260.01, 389.82 and 86.64

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Solution

The fourth proportional to 260.01, 389.82 and 86.64 is: 129.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    260.01 : 389.82 = 86.64 : x
  2. Step 2: Convert to fraction form
    260.01/389.82 = 86.64/x
  3. Step 3: Cross multiply
    260.01x = 389.82 × 86.64
  4. Step 4: Simplify right side
    260.01x = 33,774.00
  5. Step 5: Solve for x
    x = 33,774.00/260.01
  6. Step 6: Final answer
    x = 129.90

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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.