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Finding the Fourth Proportional to 256.70, 385.10 and 117.81

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Solution

The fourth proportional to 256.70, 385.10 and 117.81 is: 176.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.70 : 385.10 = 117.81 : x
  2. Step 2: Convert to fraction form
    256.70/385.10 = 117.81/x
  3. Step 3: Cross multiply
    256.70x = 385.10 × 117.81
  4. Step 4: Simplify right side
    256.70x = 45,368.93
  5. Step 5: Solve for x
    x = 45,368.93/256.70
  6. Step 6: Final answer
    x = 176.74

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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.