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Finding the Fourth Proportional to 256.85, 354.35 and 158.43

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Solution

The fourth proportional to 256.85, 354.35 and 158.43 is: 218.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.85 : 354.35 = 158.43 : x
  2. Step 2: Convert to fraction form
    256.85/354.35 = 158.43/x
  3. Step 3: Cross multiply
    256.85x = 354.35 × 158.43
  4. Step 4: Simplify right side
    256.85x = 56,140.07
  5. Step 5: Solve for x
    x = 56,140.07/256.85
  6. Step 6: Final answer
    x = 218.58

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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.