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Finding the Fourth Proportional to 671.20, 1,005.20 and 382.08

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Solution

The fourth proportional to 671.20, 1,005.20 and 382.08 is: 572.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.20 : 1,005.20 = 382.08 : x
  2. Step 2: Convert to fraction form
    671.20/1,005.20 = 382.08/x
  3. Step 3: Cross multiply
    671.20x = 1,005.20 × 382.08
  4. Step 4: Simplify right side
    671.20x = 384,066.82
  5. Step 5: Solve for x
    x = 384,066.82/671.20
  6. Step 6: Final answer
    x = 572.21

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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.