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Finding the Fourth Proportional to 962.90, 1,329.09 and 613.70

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Solution

The fourth proportional to 962.90, 1,329.09 and 613.70 is: 847.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.90 : 1,329.09 = 613.70 : x
  2. Step 2: Convert to fraction form
    962.90/1,329.09 = 613.70/x
  3. Step 3: Cross multiply
    962.90x = 1,329.09 × 613.70
  4. Step 4: Simplify right side
    962.90x = 815,662.53
  5. Step 5: Solve for x
    x = 815,662.53/962.90
  6. Step 6: Final answer
    x = 847.09

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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.