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Finding the Fourth Proportional to 817.01, 1,128.05 and 627.64

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Solution

The fourth proportional to 817.01, 1,128.05 and 627.64 is: 866.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.01 : 1,128.05 = 627.64 : x
  2. Step 2: Convert to fraction form
    817.01/1,128.05 = 627.64/x
  3. Step 3: Cross multiply
    817.01x = 1,128.05 × 627.64
  4. Step 4: Simplify right side
    817.01x = 708,012.12
  5. Step 5: Solve for x
    x = 708,012.12/817.01
  6. Step 6: Final answer
    x = 866.59

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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.