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Finding the Fourth Proportional to 671.28, 926.30 and 391.69

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Solution

The fourth proportional to 671.28, 926.30 and 391.69 is: 540.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.28 : 926.30 = 391.69 : x
  2. Step 2: Convert to fraction form
    671.28/926.30 = 391.69/x
  3. Step 3: Cross multiply
    671.28x = 926.30 × 391.69
  4. Step 4: Simplify right side
    671.28x = 362,822.45
  5. Step 5: Solve for x
    x = 362,822.45/671.28
  6. Step 6: Final answer
    x = 540.49

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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.