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Finding the Fourth Proportional to 418.95, 628.50 and 130.32

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Solution

The fourth proportional to 418.95, 628.50 and 130.32 is: 195.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.95 : 628.50 = 130.32 : x
  2. Step 2: Convert to fraction form
    418.95/628.50 = 130.32/x
  3. Step 3: Cross multiply
    418.95x = 628.50 × 130.32
  4. Step 4: Simplify right side
    418.95x = 81,906.12
  5. Step 5: Solve for x
    x = 81,906.12/418.95
  6. Step 6: Final answer
    x = 195.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.