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Finding the Fourth Proportional to 515.92, 711.92 and 303.28

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Solution

The fourth proportional to 515.92, 711.92 and 303.28 is: 418.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.92 : 711.92 = 303.28 : x
  2. Step 2: Convert to fraction form
    515.92/711.92 = 303.28/x
  3. Step 3: Cross multiply
    515.92x = 711.92 × 303.28
  4. Step 4: Simplify right side
    515.92x = 215,911.10
  5. Step 5: Solve for x
    x = 215,911.10/515.92
  6. Step 6: Final answer
    x = 418.50

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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.