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Finding the Fourth Proportional to 259.41, 389.28 and 115.13

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Solution

The fourth proportional to 259.41, 389.28 and 115.13 is: 172.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.41 : 389.28 = 115.13 : x
  2. Step 2: Convert to fraction form
    259.41/389.28 = 115.13/x
  3. Step 3: Cross multiply
    259.41x = 389.28 × 115.13
  4. Step 4: Simplify right side
    259.41x = 44,817.81
  5. Step 5: Solve for x
    x = 44,817.81/259.41
  6. Step 6: Final answer
    x = 172.77

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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.