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Finding the Fourth Proportional to 515.34, 711.05 and 305.41

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Solution

The fourth proportional to 515.34, 711.05 and 305.41 is: 421.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.34 : 711.05 = 305.41 : x
  2. Step 2: Convert to fraction form
    515.34/711.05 = 305.41/x
  3. Step 3: Cross multiply
    515.34x = 711.05 × 305.41
  4. Step 4: Simplify right side
    515.34x = 217,161.78
  5. Step 5: Solve for x
    x = 217,161.78/515.34
  6. Step 6: Final answer
    x = 421.40

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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.