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Finding the Fourth Proportional to 784.17, 1,081.67 and 518.61

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Solution

The fourth proportional to 784.17, 1,081.67 and 518.61 is: 715.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    784.17 : 1,081.67 = 518.61 : x
  2. Step 2: Convert to fraction form
    784.17/1,081.67 = 518.61/x
  3. Step 3: Cross multiply
    784.17x = 1,081.67 × 518.61
  4. Step 4: Simplify right side
    784.17x = 560,960.77
  5. Step 5: Solve for x
    x = 560,960.77/784.17
  6. Step 6: Final answer
    x = 715.36

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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.