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Finding the Fourth Proportional to 515.78, 711.70 and 303.04

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Solution

The fourth proportional to 515.78, 711.70 and 303.04 is: 418.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.78 : 711.70 = 303.04 : x
  2. Step 2: Convert to fraction form
    515.78/711.70 = 303.04/x
  3. Step 3: Cross multiply
    515.78x = 711.70 × 303.04
  4. Step 4: Simplify right side
    515.78x = 215,673.57
  5. Step 5: Solve for x
    x = 215,673.57/515.78
  6. Step 6: Final answer
    x = 418.15

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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.