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Finding the Fourth Proportional to 407.30, 609.87 and 214.52

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Solution

The fourth proportional to 407.30, 609.87 and 214.52 is: 321.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.30 : 609.87 = 214.52 : x
  2. Step 2: Convert to fraction form
    407.30/609.87 = 214.52/x
  3. Step 3: Cross multiply
    407.30x = 609.87 × 214.52
  4. Step 4: Simplify right side
    407.30x = 130,829.31
  5. Step 5: Solve for x
    x = 130,829.31/407.30
  6. Step 6: Final answer
    x = 321.21

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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.