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Finding the Fourth Proportional to 259.15, 387.95 and 171.40

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Solution

The fourth proportional to 259.15, 387.95 and 171.40 is: 256.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.15 : 387.95 = 171.40 : x
  2. Step 2: Convert to fraction form
    259.15/387.95 = 171.40/x
  3. Step 3: Cross multiply
    259.15x = 387.95 × 171.40
  4. Step 4: Simplify right side
    259.15x = 66,494.63
  5. Step 5: Solve for x
    x = 66,494.63/259.15
  6. Step 6: Final answer
    x = 256.59

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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.