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Finding the Fourth Proportional to 702.55, 969.78 and 422.80

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Solution

The fourth proportional to 702.55, 969.78 and 422.80 is: 583.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.55 : 969.78 = 422.80 : x
  2. Step 2: Convert to fraction form
    702.55/969.78 = 422.80/x
  3. Step 3: Cross multiply
    702.55x = 969.78 × 422.80
  4. Step 4: Simplify right side
    702.55x = 410,022.98
  5. Step 5: Solve for x
    x = 410,022.98/702.55
  6. Step 6: Final answer
    x = 583.62

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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.