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Finding the Fourth Proportional to 632.64, 872.64 and 396.60

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Solution

The fourth proportional to 632.64, 872.64 and 396.60 is: 547.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    632.64 : 872.64 = 396.60 : x
  2. Step 2: Convert to fraction form
    632.64/872.64 = 396.60/x
  3. Step 3: Cross multiply
    632.64x = 872.64 × 396.60
  4. Step 4: Simplify right side
    632.64x = 346,089.02
  5. Step 5: Solve for x
    x = 346,089.02/632.64
  6. Step 6: Final answer
    x = 547.06

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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.