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Finding the Fourth Proportional to 775.22, 1,068.71 and 634.68

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Solution

The fourth proportional to 775.22, 1,068.71 and 634.68 is: 874.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.22 : 1,068.71 = 634.68 : x
  2. Step 2: Convert to fraction form
    775.22/1,068.71 = 634.68/x
  3. Step 3: Cross multiply
    775.22x = 1,068.71 × 634.68
  4. Step 4: Simplify right side
    775.22x = 678,285.69
  5. Step 5: Solve for x
    x = 678,285.69/775.22
  6. Step 6: Final answer
    x = 874.96

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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.