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Finding the Fourth Proportional to 256.98, 385.66 and 178.72

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Solution

The fourth proportional to 256.98, 385.66 and 178.72 is: 268.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.98 : 385.66 = 178.72 : x
  2. Step 2: Convert to fraction form
    256.98/385.66 = 178.72/x
  3. Step 3: Cross multiply
    256.98x = 385.66 × 178.72
  4. Step 4: Simplify right side
    256.98x = 68,925.16
  5. Step 5: Solve for x
    x = 68,925.16/256.98
  6. Step 6: Final answer
    x = 268.21

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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.