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Finding the Fourth Proportional to 627.12, 935.64 and 617.40

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Solution

The fourth proportional to 627.12, 935.64 and 617.40 is: 921.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.12 : 935.64 = 617.40 : x
  2. Step 2: Convert to fraction form
    627.12/935.64 = 617.40/x
  3. Step 3: Cross multiply
    627.12x = 935.64 × 617.40
  4. Step 4: Simplify right side
    627.12x = 577,664.14
  5. Step 5: Solve for x
    x = 577,664.14/627.12
  6. Step 6: Final answer
    x = 921.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.