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Finding the Fourth Proportional to 259.74, 389.28 and 115.47

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Solution

The fourth proportional to 259.74, 389.28 and 115.47 is: 173.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.74 : 389.28 = 115.47 : x
  2. Step 2: Convert to fraction form
    259.74/389.28 = 115.47/x
  3. Step 3: Cross multiply
    259.74x = 389.28 × 115.47
  4. Step 4: Simplify right side
    259.74x = 44,950.16
  5. Step 5: Solve for x
    x = 44,950.16/259.74
  6. Step 6: Final answer
    x = 173.06

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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.