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Finding the Fourth Proportional to 816.62, 1,128.35 and 718.21

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Solution

The fourth proportional to 816.62, 1,128.35 and 718.21 is: 992.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.62 : 1,128.35 = 718.21 : x
  2. Step 2: Convert to fraction form
    816.62/1,128.35 = 718.21/x
  3. Step 3: Cross multiply
    816.62x = 1,128.35 × 718.21
  4. Step 4: Simplify right side
    816.62x = 810,383.02
  5. Step 5: Solve for x
    x = 810,383.02/816.62
  6. Step 6: Final answer
    x = 992.36

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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.