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Finding the Fourth Proportional to 766.30, 1,057.49 and 416.99

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Solution

The fourth proportional to 766.30, 1,057.49 and 416.99 is: 575.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.30 : 1,057.49 = 416.99 : x
  2. Step 2: Convert to fraction form
    766.30/1,057.49 = 416.99/x
  3. Step 3: Cross multiply
    766.30x = 1,057.49 × 416.99
  4. Step 4: Simplify right side
    766.30x = 440,962.76
  5. Step 5: Solve for x
    x = 440,962.76/766.30
  6. Step 6: Final answer
    x = 575.44

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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.