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Finding the Fourth Proportional to 259.65, 389.61 and 115.38

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Solution

The fourth proportional to 259.65, 389.61 and 115.38 is: 173.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.65 : 389.61 = 115.38 : x
  2. Step 2: Convert to fraction form
    259.65/389.61 = 115.38/x
  3. Step 3: Cross multiply
    259.65x = 389.61 × 115.38
  4. Step 4: Simplify right side
    259.65x = 44,953.20
  5. Step 5: Solve for x
    x = 44,953.20/259.65
  6. Step 6: Final answer
    x = 173.13

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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.