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Finding the Fourth Proportional to 412.02, 619.65 and 387.59

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Solution

The fourth proportional to 412.02, 619.65 and 387.59 is: 582.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.02 : 619.65 = 387.59 : x
  2. Step 2: Convert to fraction form
    412.02/619.65 = 387.59/x
  3. Step 3: Cross multiply
    412.02x = 619.65 × 387.59
  4. Step 4: Simplify right side
    412.02x = 240,167.05
  5. Step 5: Solve for x
    x = 240,167.05/412.02
  6. Step 6: Final answer
    x = 582.90

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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.