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Finding the Fourth Proportional to 419.17, 628.79 and 145.15

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Solution

The fourth proportional to 419.17, 628.79 and 145.15 is: 217.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.17 : 628.79 = 145.15 : x
  2. Step 2: Convert to fraction form
    419.17/628.79 = 145.15/x
  3. Step 3: Cross multiply
    419.17x = 628.79 × 145.15
  4. Step 4: Simplify right side
    419.17x = 91,268.87
  5. Step 5: Solve for x
    x = 91,268.87/419.17
  6. Step 6: Final answer
    x = 217.74

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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.