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Finding the Fourth Proportional to 259.55, 389.34 and 86.14

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Solution

The fourth proportional to 259.55, 389.34 and 86.14 is: 129.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.55 : 389.34 = 86.14 : x
  2. Step 2: Convert to fraction form
    259.55/389.34 = 86.14/x
  3. Step 3: Cross multiply
    259.55x = 389.34 × 86.14
  4. Step 4: Simplify right side
    259.55x = 33,537.75
  5. Step 5: Solve for x
    x = 33,537.75/259.55
  6. Step 6: Final answer
    x = 129.21

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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.