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Finding the Fourth Proportional to 719.90, 995.09 and 662.49

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Solution

The fourth proportional to 719.90, 995.09 and 662.49 is: 915.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.90 : 995.09 = 662.49 : x
  2. Step 2: Convert to fraction form
    719.90/995.09 = 662.49/x
  3. Step 3: Cross multiply
    719.90x = 995.09 × 662.49
  4. Step 4: Simplify right side
    719.90x = 659,233.86
  5. Step 5: Solve for x
    x = 659,233.86/719.90
  6. Step 6: Final answer
    x = 915.74

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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.