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Finding the Fourth Proportional to 995.29, 1,382.51 and 979.40

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Solution

The fourth proportional to 995.29, 1,382.51 and 979.40 is: 1,360.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.29 : 1,382.51 = 979.40 : x
  2. Step 2: Convert to fraction form
    995.29/1,382.51 = 979.40/x
  3. Step 3: Cross multiply
    995.29x = 1,382.51 × 979.40
  4. Step 4: Simplify right side
    995.29x = 1,354,030.29
  5. Step 5: Solve for x
    x = 1,354,030.29/995.29
  6. Step 6: Final answer
    x = 1,360.44

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.