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Finding the Fourth Proportional to 642.27, 885.47 and 548.63

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Solution

The fourth proportional to 642.27, 885.47 and 548.63 is: 756.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.27 : 885.47 = 548.63 : x
  2. Step 2: Convert to fraction form
    642.27/885.47 = 548.63/x
  3. Step 3: Cross multiply
    642.27x = 885.47 × 548.63
  4. Step 4: Simplify right side
    642.27x = 485,788.24
  5. Step 5: Solve for x
    x = 485,788.24/642.27
  6. Step 6: Final answer
    x = 756.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.