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Finding the Fourth Proportional to 407.39, 609.53 and 319.77

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Solution

The fourth proportional to 407.39, 609.53 and 319.77 is: 478.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.39 : 609.53 = 319.77 : x
  2. Step 2: Convert to fraction form
    407.39/609.53 = 319.77/x
  3. Step 3: Cross multiply
    407.39x = 609.53 × 319.77
  4. Step 4: Simplify right side
    407.39x = 194,907.81
  5. Step 5: Solve for x
    x = 194,907.81/407.39
  6. Step 6: Final answer
    x = 478.44

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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.