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Finding the Fourth Proportional to 642.56, 963.76 and 257.52

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Solution

The fourth proportional to 642.56, 963.76 and 257.52 is: 386.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.56 : 963.76 = 257.52 : x
  2. Step 2: Convert to fraction form
    642.56/963.76 = 257.52/x
  3. Step 3: Cross multiply
    642.56x = 963.76 × 257.52
  4. Step 4: Simplify right side
    642.56x = 248,187.48
  5. Step 5: Solve for x
    x = 248,187.48/642.56
  6. Step 6: Final answer
    x = 386.25

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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.