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Finding the Fourth Proportional to 995.64, 1,373.08 and 717.72

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Solution

The fourth proportional to 995.64, 1,373.08 and 717.72 is: 989.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.64 : 1,373.08 = 717.72 : x
  2. Step 2: Convert to fraction form
    995.64/1,373.08 = 717.72/x
  3. Step 3: Cross multiply
    995.64x = 1,373.08 × 717.72
  4. Step 4: Simplify right side
    995.64x = 985,486.98
  5. Step 5: Solve for x
    x = 985,486.98/995.64
  6. Step 6: Final answer
    x = 989.80

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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.