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Finding the Fourth Proportional to 671.44, 928.18 and 665.22

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Solution

The fourth proportional to 671.44, 928.18 and 665.22 is: 919.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.44 : 928.18 = 665.22 : x
  2. Step 2: Convert to fraction form
    671.44/928.18 = 665.22/x
  3. Step 3: Cross multiply
    671.44x = 928.18 × 665.22
  4. Step 4: Simplify right side
    671.44x = 617,443.90
  5. Step 5: Solve for x
    x = 617,443.90/671.44
  6. Step 6: Final answer
    x = 919.58

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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.