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Finding the Fourth Proportional to 515.63, 711.28 and 305.60

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Solution

The fourth proportional to 515.63, 711.28 and 305.60 is: 421.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.63 : 711.28 = 305.60 : x
  2. Step 2: Convert to fraction form
    515.63/711.28 = 305.60/x
  3. Step 3: Cross multiply
    515.63x = 711.28 × 305.60
  4. Step 4: Simplify right side
    515.63x = 217,370.50
  5. Step 5: Solve for x
    x = 217,370.50/515.63
  6. Step 6: Final answer
    x = 421.56

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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.