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Finding the Fourth Proportional to 627.66, 865.47 and 428.52

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Solution

The fourth proportional to 627.66, 865.47 and 428.52 is: 590.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.66 : 865.47 = 428.52 : x
  2. Step 2: Convert to fraction form
    627.66/865.47 = 428.52/x
  3. Step 3: Cross multiply
    627.66x = 865.47 × 428.52
  4. Step 4: Simplify right side
    627.66x = 370,871.20
  5. Step 5: Solve for x
    x = 370,871.20/627.66
  6. Step 6: Final answer
    x = 590.88

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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.