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Finding the Fourth Proportional to 407.55, 609.96 and 339.21

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Solution

The fourth proportional to 407.55, 609.96 and 339.21 is: 507.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.55 : 609.96 = 339.21 : x
  2. Step 2: Convert to fraction form
    407.55/609.96 = 339.21/x
  3. Step 3: Cross multiply
    407.55x = 609.96 × 339.21
  4. Step 4: Simplify right side
    407.55x = 206,904.53
  5. Step 5: Solve for x
    x = 206,904.53/407.55
  6. Step 6: Final answer
    x = 507.68

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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.