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Finding the Fourth Proportional to 515.71, 711.58 and 306.05

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Solution

The fourth proportional to 515.71, 711.58 and 306.05 is: 422.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.71 : 711.58 = 306.05 : x
  2. Step 2: Convert to fraction form
    515.71/711.58 = 306.05/x
  3. Step 3: Cross multiply
    515.71x = 711.58 × 306.05
  4. Step 4: Simplify right side
    515.71x = 217,774.74
  5. Step 5: Solve for x
    x = 217,774.74/515.71
  6. Step 6: Final answer
    x = 422.28

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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.