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Finding the Fourth Proportional to 259.64, 389.12 and 115.23

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Solution

The fourth proportional to 259.64, 389.12 and 115.23 is: 172.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.64 : 389.12 = 115.23 : x
  2. Step 2: Convert to fraction form
    259.64/389.12 = 115.23/x
  3. Step 3: Cross multiply
    259.64x = 389.12 × 115.23
  4. Step 4: Simplify right side
    259.64x = 44,837.72
  5. Step 5: Solve for x
    x = 44,837.72/259.64
  6. Step 6: Final answer
    x = 172.70

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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.