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Finding the Fourth Proportional to 259.95, 389.99 and 115.63

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Solution

The fourth proportional to 259.95, 389.99 and 115.63 is: 173.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.95 : 389.99 = 115.63 : x
  2. Step 2: Convert to fraction form
    259.95/389.99 = 115.63/x
  3. Step 3: Cross multiply
    259.95x = 389.99 × 115.63
  4. Step 4: Simplify right side
    259.95x = 45,094.54
  5. Step 5: Solve for x
    x = 45,094.54/259.95
  6. Step 6: Final answer
    x = 173.47

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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.