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Finding the Fourth Proportional to 627.20, 865.40 and 365.18

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Solution

The fourth proportional to 627.20, 865.40 and 365.18 is: 503.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.20 : 865.40 = 365.18 : x
  2. Step 2: Convert to fraction form
    627.20/865.40 = 365.18/x
  3. Step 3: Cross multiply
    627.20x = 865.40 × 365.18
  4. Step 4: Simplify right side
    627.20x = 316,026.77
  5. Step 5: Solve for x
    x = 316,026.77/627.20
  6. Step 6: Final answer
    x = 503.87

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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.