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Finding the Fourth Proportional to 822.56, 1,135.70 and 627.08

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Solution

The fourth proportional to 822.56, 1,135.70 and 627.08 is: 865.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.56 : 1,135.70 = 627.08 : x
  2. Step 2: Convert to fraction form
    822.56/1,135.70 = 627.08/x
  3. Step 3: Cross multiply
    822.56x = 1,135.70 × 627.08
  4. Step 4: Simplify right side
    822.56x = 712,174.76
  5. Step 5: Solve for x
    x = 712,174.76/822.56
  6. Step 6: Final answer
    x = 865.80

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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.