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Finding the Fourth Proportional to 256.14, 383.95 and 140.47

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Solution

The fourth proportional to 256.14, 383.95 and 140.47 is: 210.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.14 : 383.95 = 140.47 : x
  2. Step 2: Convert to fraction form
    256.14/383.95 = 140.47/x
  3. Step 3: Cross multiply
    256.14x = 383.95 × 140.47
  4. Step 4: Simplify right side
    256.14x = 53,933.46
  5. Step 5: Solve for x
    x = 53,933.46/256.14
  6. Step 6: Final answer
    x = 210.56

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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.