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Finding the Fourth Proportional to 419.90, 630.23 and 214.61

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Solution

The fourth proportional to 419.90, 630.23 and 214.61 is: 322.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.90 : 630.23 = 214.61 : x
  2. Step 2: Convert to fraction form
    419.90/630.23 = 214.61/x
  3. Step 3: Cross multiply
    419.90x = 630.23 × 214.61
  4. Step 4: Simplify right side
    419.90x = 135,252.08
  5. Step 5: Solve for x
    x = 135,252.08/419.90
  6. Step 6: Final answer
    x = 322.11

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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.