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Finding the Fourth Proportional to 1,006.63, 1,389.15 and 613.64

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Solution

The fourth proportional to 1,006.63, 1,389.15 and 613.64 is: 846.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.63 : 1,389.15 = 613.64 : x
  2. Step 2: Convert to fraction form
    1,006.63/1,389.15 = 613.64/x
  3. Step 3: Cross multiply
    1,006.63x = 1,389.15 × 613.64
  4. Step 4: Simplify right side
    1,006.63x = 852,441.48
  5. Step 5: Solve for x
    x = 852,441.48/1,006.63
  6. Step 6: Final answer
    x = 846.83

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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.