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Finding the Fourth Proportional to 721.79, 995.72 and 693.84

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Solution

The fourth proportional to 721.79, 995.72 and 693.84 is: 957.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    721.79 : 995.72 = 693.84 : x
  2. Step 2: Convert to fraction form
    721.79/995.72 = 693.84/x
  3. Step 3: Cross multiply
    721.79x = 995.72 × 693.84
  4. Step 4: Simplify right side
    721.79x = 690,870.36
  5. Step 5: Solve for x
    x = 690,870.36/721.79
  6. Step 6: Final answer
    x = 957.16

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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.