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Finding the Fourth Proportional to 766.30, 1,148.65 and 419.10

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Solution

The fourth proportional to 766.30, 1,148.65 and 419.10 is: 628.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.30 : 1,148.65 = 419.10 : x
  2. Step 2: Convert to fraction form
    766.30/1,148.65 = 419.10/x
  3. Step 3: Cross multiply
    766.30x = 1,148.65 × 419.10
  4. Step 4: Simplify right side
    766.30x = 481,399.22
  5. Step 5: Solve for x
    x = 481,399.22/766.30
  6. Step 6: Final answer
    x = 628.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.