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Finding the Fourth Proportional to 671.52, 926.46 and 438.78

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Solution

The fourth proportional to 671.52, 926.46 and 438.78 is: 605.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.52 : 926.46 = 438.78 : x
  2. Step 2: Convert to fraction form
    671.52/926.46 = 438.78/x
  3. Step 3: Cross multiply
    671.52x = 926.46 × 438.78
  4. Step 4: Simplify right side
    671.52x = 406,512.12
  5. Step 5: Solve for x
    x = 406,512.12/671.52
  6. Step 6: Final answer
    x = 605.36

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1.5x scale

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.