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Finding the Fourth Proportional to 259.72, 389.65 and 122.86

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Solution

The fourth proportional to 259.72, 389.65 and 122.86 is: 184.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.72 : 389.65 = 122.86 : x
  2. Step 2: Convert to fraction form
    259.72/389.65 = 122.86/x
  3. Step 3: Cross multiply
    259.72x = 389.65 × 122.86
  4. Step 4: Simplify right side
    259.72x = 47,872.40
  5. Step 5: Solve for x
    x = 47,872.40/259.72
  6. Step 6: Final answer
    x = 184.32

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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.