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Finding the Fourth Proportional to 515.41, 711.23 and 305.58

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Solution

The fourth proportional to 515.41, 711.23 and 305.58 is: 421.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.41 : 711.23 = 305.58 : x
  2. Step 2: Convert to fraction form
    515.41/711.23 = 305.58/x
  3. Step 3: Cross multiply
    515.41x = 711.23 × 305.58
  4. Step 4: Simplify right side
    515.41x = 217,334.11
  5. Step 5: Solve for x
    x = 217,334.11/515.41
  6. Step 6: Final answer
    x = 421.67

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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.