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Finding the Fourth Proportional to 259.08, 388.38 and 145

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Solution

The fourth proportional to 259.08, 388.38 and 145 is: 217.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.08 : 388.38 = 145 : x
  2. Step 2: Convert to fraction form
    259.08/388.38 = 145/x
  3. Step 3: Cross multiply
    259.08x = 388.38 × 145
  4. Step 4: Simplify right side
    259.08x = 56,315.10
  5. Step 5: Solve for x
    x = 56,315.10/259.08
  6. Step 6: Final answer
    x = 217.37

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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.