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Finding the Fourth Proportional to 667.72, 993.65 and 641.80

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Solution

The fourth proportional to 667.72, 993.65 and 641.80 is: 955.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.72 : 993.65 = 641.80 : x
  2. Step 2: Convert to fraction form
    667.72/993.65 = 641.80/x
  3. Step 3: Cross multiply
    667.72x = 993.65 × 641.80
  4. Step 4: Simplify right side
    667.72x = 637,724.57
  5. Step 5: Solve for x
    x = 637,724.57/667.72
  6. Step 6: Final answer
    x = 955.08

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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.