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Finding the Fourth Proportional to 816.98, 1,126.87 and 682.01

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Solution

The fourth proportional to 816.98, 1,126.87 and 682.01 is: 940.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.98 : 1,126.87 = 682.01 : x
  2. Step 2: Convert to fraction form
    816.98/1,126.87 = 682.01/x
  3. Step 3: Cross multiply
    816.98x = 1,126.87 × 682.01
  4. Step 4: Simplify right side
    816.98x = 768,533.20
  5. Step 5: Solve for x
    x = 768,533.20/816.98
  6. Step 6: Final answer
    x = 940.70

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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.