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Finding the Fourth Proportional to 876.21, 1,208.70 and 627.71

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Solution

The fourth proportional to 876.21, 1,208.70 and 627.71 is: 865.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.21 : 1,208.70 = 627.71 : x
  2. Step 2: Convert to fraction form
    876.21/1,208.70 = 627.71/x
  3. Step 3: Cross multiply
    876.21x = 1,208.70 × 627.71
  4. Step 4: Simplify right side
    876.21x = 758,707.03
  5. Step 5: Solve for x
    x = 758,707.03/876.21
  6. Step 6: Final answer
    x = 865.90

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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.