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Finding the Fourth Proportional to 643.05, 887.07 and 495.63

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Solution

The fourth proportional to 643.05, 887.07 and 495.63 is: 683.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.05 : 887.07 = 495.63 : x
  2. Step 2: Convert to fraction form
    643.05/887.07 = 495.63/x
  3. Step 3: Cross multiply
    643.05x = 887.07 × 495.63
  4. Step 4: Simplify right side
    643.05x = 439,658.50
  5. Step 5: Solve for x
    x = 439,658.50/643.05
  6. Step 6: Final answer
    x = 683.71

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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.