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Finding the Fourth Proportional to 515.60, 711.57 and 305.75

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Solution

The fourth proportional to 515.60, 711.57 and 305.75 is: 421.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.60 : 711.57 = 305.75 : x
  2. Step 2: Convert to fraction form
    515.60/711.57 = 305.75/x
  3. Step 3: Cross multiply
    515.60x = 711.57 × 305.75
  4. Step 4: Simplify right side
    515.60x = 217,558.97
  5. Step 5: Solve for x
    x = 217,558.97/515.60
  6. Step 6: Final answer
    x = 421.96

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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.