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Finding the Fourth Proportional to 784.11, 1,081.70 and 518.49

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Solution

The fourth proportional to 784.11, 1,081.70 and 518.49 is: 715.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.11 : 1,081.70 = 518.49 : x
  2. Step 2: Convert to fraction form
    784.11/1,081.70 = 518.49/x
  3. Step 3: Cross multiply
    784.11x = 1,081.70 × 518.49
  4. Step 4: Simplify right side
    784.11x = 560,849.98
  5. Step 5: Solve for x
    x = 560,849.98/784.11
  6. Step 6: Final answer
    x = 715.27

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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.