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Finding the Fourth Proportional to 766.63, 1,057.94 and 417.31

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Solution

The fourth proportional to 766.63, 1,057.94 and 417.31 is: 575.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.63 : 1,057.94 = 417.31 : x
  2. Step 2: Convert to fraction form
    766.63/1,057.94 = 417.31/x
  3. Step 3: Cross multiply
    766.63x = 1,057.94 × 417.31
  4. Step 4: Simplify right side
    766.63x = 441,488.94
  5. Step 5: Solve for x
    x = 441,488.94/766.63
  6. Step 6: Final answer
    x = 575.88

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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.