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Finding the Fourth Proportional to 842.76, 1,264.96 and 518.76

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Solution

The fourth proportional to 842.76, 1,264.96 and 518.76 is: 778.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.76 : 1,264.96 = 518.76 : x
  2. Step 2: Convert to fraction form
    842.76/1,264.96 = 518.76/x
  3. Step 3: Cross multiply
    842.76x = 1,264.96 × 518.76
  4. Step 4: Simplify right side
    842.76x = 656,210.65
  5. Step 5: Solve for x
    x = 656,210.65/842.76
  6. Step 6: Final answer
    x = 778.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.