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Finding the Fourth Proportional to 256.31, 384.50 and 117.47

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Solution

The fourth proportional to 256.31, 384.50 and 117.47 is: 176.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.31 : 384.50 = 117.47 : x
  2. Step 2: Convert to fraction form
    256.31/384.50 = 117.47/x
  3. Step 3: Cross multiply
    256.31x = 384.50 × 117.47
  4. Step 4: Simplify right side
    256.31x = 45,165.59
  5. Step 5: Solve for x
    x = 45,165.59/256.31
  6. Step 6: Final answer
    x = 176.21

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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.