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Finding the Fourth Proportional to 516, 712.08 and 309.04

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Solution

The fourth proportional to 516, 712.08 and 309.04 is: 426.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    516 : 712.08 = 309.04 : x
  2. Step 2: Convert to fraction form
    516/712.08 = 309.04/x
  3. Step 3: Cross multiply
    516x = 712.08 × 309.04
  4. Step 4: Simplify right side
    516x = 220,061.20
  5. Step 5: Solve for x
    x = 220,061.20/516
  6. Step 6: Final answer
    x = 426.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.