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Finding the Fourth Proportional to 315.88, 434.48 and 256.18

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Solution

The fourth proportional to 315.88, 434.48 and 256.18 is: 352.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.88 : 434.48 = 256.18 : x
  2. Step 2: Convert to fraction form
    315.88/434.48 = 256.18/x
  3. Step 3: Cross multiply
    315.88x = 434.48 × 256.18
  4. Step 4: Simplify right side
    315.88x = 111,305.09
  5. Step 5: Solve for x
    x = 111,305.09/315.88
  6. Step 6: Final answer
    x = 352.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.