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Finding the Fourth Proportional to 995.70, 1,374.87 and 890.60

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Solution

The fourth proportional to 995.70, 1,374.87 and 890.60 is: 1,229.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.70 : 1,374.87 = 890.60 : x
  2. Step 2: Convert to fraction form
    995.70/1,374.87 = 890.60/x
  3. Step 3: Cross multiply
    995.70x = 1,374.87 × 890.60
  4. Step 4: Simplify right side
    995.70x = 1,224,457.00
  5. Step 5: Solve for x
    x = 1,224,457.00/995.70
  6. Step 6: Final answer
    x = 1,229.75

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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.