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Finding the Fourth Proportional to 816.93, 1,126.43 and 620.10

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Solution

The fourth proportional to 816.93, 1,126.43 and 620.10 is: 855.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.93 : 1,126.43 = 620.10 : x
  2. Step 2: Convert to fraction form
    816.93/1,126.43 = 620.10/x
  3. Step 3: Cross multiply
    816.93x = 1,126.43 × 620.10
  4. Step 4: Simplify right side
    816.93x = 698,496.14
  5. Step 5: Solve for x
    x = 698,496.14/816.93
  6. Step 6: Final answer
    x = 855.03

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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.