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Finding the Fourth Proportional to 627.48, 865.62 and 487.35

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Solution

The fourth proportional to 627.48, 865.62 and 487.35 is: 672.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.48 : 865.62 = 487.35 : x
  2. Step 2: Convert to fraction form
    627.48/865.62 = 487.35/x
  3. Step 3: Cross multiply
    627.48x = 865.62 × 487.35
  4. Step 4: Simplify right side
    627.48x = 421,859.91
  5. Step 5: Solve for x
    x = 421,859.91/627.48
  6. Step 6: Final answer
    x = 672.31

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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.