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Finding the Fourth Proportional to 1,006.36, 1,389 and 613.30

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Solution

The fourth proportional to 1,006.36, 1,389 and 613.30 is: 846.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.36 : 1,389 = 613.30 : x
  2. Step 2: Convert to fraction form
    1,006.36/1,389 = 613.30/x
  3. Step 3: Cross multiply
    1,006.36x = 1,389 × 613.30
  4. Step 4: Simplify right side
    1,006.36x = 851,873.70
  5. Step 5: Solve for x
    x = 851,873.70/1,006.36
  6. Step 6: Final answer
    x = 846.49

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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.