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Finding the Fourth Proportional to 667.95, 1,006.91 and 623.35

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Solution

The fourth proportional to 667.95, 1,006.91 and 623.35 is: 939.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.95 : 1,006.91 = 623.35 : x
  2. Step 2: Convert to fraction form
    667.95/1,006.91 = 623.35/x
  3. Step 3: Cross multiply
    667.95x = 1,006.91 × 623.35
  4. Step 4: Simplify right side
    667.95x = 627,657.35
  5. Step 5: Solve for x
    x = 627,657.35/667.95
  6. Step 6: Final answer
    x = 939.68

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.