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Finding the Fourth Proportional to 674.22, 930.15 and 627.90

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Solution

The fourth proportional to 674.22, 930.15 and 627.90 is: 866.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.22 : 930.15 = 627.90 : x
  2. Step 2: Convert to fraction form
    674.22/930.15 = 627.90/x
  3. Step 3: Cross multiply
    674.22x = 930.15 × 627.90
  4. Step 4: Simplify right side
    674.22x = 584,041.19
  5. Step 5: Solve for x
    x = 584,041.19/674.22
  6. Step 6: Final answer
    x = 866.25

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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.