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Finding the Fourth Proportional to 712.98, 982.98 and 690.30

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Solution

The fourth proportional to 712.98, 982.98 and 690.30 is: 951.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.98 : 982.98 = 690.30 : x
  2. Step 2: Convert to fraction form
    712.98/982.98 = 690.30/x
  3. Step 3: Cross multiply
    712.98x = 982.98 × 690.30
  4. Step 4: Simplify right side
    712.98x = 678,551.09
  5. Step 5: Solve for x
    x = 678,551.09/712.98
  6. Step 6: Final answer
    x = 951.71

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1.5x scale

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.