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Finding the Fourth Proportional to 342.04, 512.96 and 287.21

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Solution

The fourth proportional to 342.04, 512.96 and 287.21 is: 430.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.04 : 512.96 = 287.21 : x
  2. Step 2: Convert to fraction form
    342.04/512.96 = 287.21/x
  3. Step 3: Cross multiply
    342.04x = 512.96 × 287.21
  4. Step 4: Simplify right side
    342.04x = 147,327.90
  5. Step 5: Solve for x
    x = 147,327.90/342.04
  6. Step 6: Final answer
    x = 430.73

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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.