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Finding the Fourth Proportional to 766.66, 1,057.08 and 626.26

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Solution

The fourth proportional to 766.66, 1,057.08 and 626.26 is: 863.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.66 : 1,057.08 = 626.26 : x
  2. Step 2: Convert to fraction form
    766.66/1,057.08 = 626.26/x
  3. Step 3: Cross multiply
    766.66x = 1,057.08 × 626.26
  4. Step 4: Simplify right side
    766.66x = 662,006.92
  5. Step 5: Solve for x
    x = 662,006.92/766.66
  6. Step 6: Final answer
    x = 863.49

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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.