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Finding the Fourth Proportional to 718.06, 995.96 and 688.90

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Solution

The fourth proportional to 718.06, 995.96 and 688.90 is: 955.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.06 : 995.96 = 688.90 : x
  2. Step 2: Convert to fraction form
    718.06/995.96 = 688.90/x
  3. Step 3: Cross multiply
    718.06x = 995.96 × 688.90
  4. Step 4: Simplify right side
    718.06x = 686,116.84
  5. Step 5: Solve for x
    x = 686,116.84/718.06
  6. Step 6: Final answer
    x = 955.51

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.