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Finding the Fourth Proportional to 1,006.39, 1,389.18 and 613.45

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Solution

The fourth proportional to 1,006.39, 1,389.18 and 613.45 is: 846.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,006.39 : 1,389.18 = 613.45 : x
  2. Step 2: Convert to fraction form
    1,006.39/1,389.18 = 613.45/x
  3. Step 3: Cross multiply
    1,006.39x = 1,389.18 × 613.45
  4. Step 4: Simplify right side
    1,006.39x = 852,192.47
  5. Step 5: Solve for x
    x = 852,192.47/1,006.39
  6. Step 6: Final answer
    x = 846.78

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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.