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Finding the Fourth Proportional to 419.64, 630.05 and 214.35

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Solution

The fourth proportional to 419.64, 630.05 and 214.35 is: 321.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.64 : 630.05 = 214.35 : x
  2. Step 2: Convert to fraction form
    419.64/630.05 = 214.35/x
  3. Step 3: Cross multiply
    419.64x = 630.05 × 214.35
  4. Step 4: Simplify right side
    419.64x = 135,050.15
  5. Step 5: Solve for x
    x = 135,050.15/419.64
  6. Step 6: Final answer
    x = 321.82

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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.