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Finding the Fourth Proportional to 643.47, 959.56 and 637.63

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Solution

The fourth proportional to 643.47, 959.56 and 637.63 is: 950.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.47 : 959.56 = 637.63 : x
  2. Step 2: Convert to fraction form
    643.47/959.56 = 637.63/x
  3. Step 3: Cross multiply
    643.47x = 959.56 × 637.63
  4. Step 4: Simplify right side
    643.47x = 611,839.85
  5. Step 5: Solve for x
    x = 611,839.85/643.47
  6. Step 6: Final answer
    x = 950.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.