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Finding the Fourth Proportional to 256.58, 385.07 and 188.28

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Solution

The fourth proportional to 256.58, 385.07 and 188.28 is: 282.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.58 : 385.07 = 188.28 : x
  2. Step 2: Convert to fraction form
    256.58/385.07 = 188.28/x
  3. Step 3: Cross multiply
    256.58x = 385.07 × 188.28
  4. Step 4: Simplify right side
    256.58x = 72,501.00
  5. Step 5: Solve for x
    x = 72,501.00/256.58
  6. Step 6: Final answer
    x = 282.56

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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.