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Finding the Fourth Proportional to 766.38, 1,056.87 and 684.30

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Solution

The fourth proportional to 766.38, 1,056.87 and 684.30 is: 943.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.38 : 1,056.87 = 684.30 : x
  2. Step 2: Convert to fraction form
    766.38/1,056.87 = 684.30/x
  3. Step 3: Cross multiply
    766.38x = 1,056.87 × 684.30
  4. Step 4: Simplify right side
    766.38x = 723,216.14
  5. Step 5: Solve for x
    x = 723,216.14/766.38
  6. Step 6: Final answer
    x = 943.68

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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.