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Finding the Fourth Proportional to 515.88, 711.91 and 279.83

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Solution

The fourth proportional to 515.88, 711.91 and 279.83 is: 386.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.88 : 711.91 = 279.83 : x
  2. Step 2: Convert to fraction form
    515.88/711.91 = 279.83/x
  3. Step 3: Cross multiply
    515.88x = 711.91 × 279.83
  4. Step 4: Simplify right side
    515.88x = 199,215.90
  5. Step 5: Solve for x
    x = 199,215.90/515.88
  6. Step 6: Final answer
    x = 386.17

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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.