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Finding the Fourth Proportional to 641.36, 956.90 and 553.88

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Solution

The fourth proportional to 641.36, 956.90 and 553.88 is: 826.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.36 : 956.90 = 553.88 : x
  2. Step 2: Convert to fraction form
    641.36/956.90 = 553.88/x
  3. Step 3: Cross multiply
    641.36x = 956.90 × 553.88
  4. Step 4: Simplify right side
    641.36x = 530,007.77
  5. Step 5: Solve for x
    x = 530,007.77/641.36
  6. Step 6: Final answer
    x = 826.38

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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.