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Finding the Fourth Proportional to 256.93, 354.59 and 220.21

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Solution

The fourth proportional to 256.93, 354.59 and 220.21 is: 303.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.93 : 354.59 = 220.21 : x
  2. Step 2: Convert to fraction form
    256.93/354.59 = 220.21/x
  3. Step 3: Cross multiply
    256.93x = 354.59 × 220.21
  4. Step 4: Simplify right side
    256.93x = 78,083.16
  5. Step 5: Solve for x
    x = 78,083.16/256.93
  6. Step 6: Final answer
    x = 303.91

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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.