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Finding the Fourth Proportional to 702.69, 969.65 and 387.96

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Solution

The fourth proportional to 702.69, 969.65 and 387.96 is: 535.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    702.69 : 969.65 = 387.96 : x
  2. Step 2: Convert to fraction form
    702.69/969.65 = 387.96/x
  3. Step 3: Cross multiply
    702.69x = 969.65 × 387.96
  4. Step 4: Simplify right side
    702.69x = 376,183.48
  5. Step 5: Solve for x
    x = 376,183.48/702.69
  6. Step 6: Final answer
    x = 535.35

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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.