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Finding the Fourth Proportional to 995.09, 1,490.81 and 821.34

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Solution

The fourth proportional to 995.09, 1,490.81 and 821.34 is: 1,230.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.09 : 1,490.81 = 821.34 : x
  2. Step 2: Convert to fraction form
    995.09/1,490.81 = 821.34/x
  3. Step 3: Cross multiply
    995.09x = 1,490.81 × 821.34
  4. Step 4: Simplify right side
    995.09x = 1,224,457.78
  5. Step 5: Solve for x
    x = 1,224,457.78/995.09
  6. Step 6: Final answer
    x = 1,230.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.