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Finding the Fourth Proportional to 936.79, 1,292.87 and 517.18

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Solution

The fourth proportional to 936.79, 1,292.87 and 517.18 is: 713.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.79 : 1,292.87 = 517.18 : x
  2. Step 2: Convert to fraction form
    936.79/1,292.87 = 517.18/x
  3. Step 3: Cross multiply
    936.79x = 1,292.87 × 517.18
  4. Step 4: Simplify right side
    936.79x = 668,643.92
  5. Step 5: Solve for x
    x = 668,643.92/936.79
  6. Step 6: Final answer
    x = 713.76

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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.