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Finding the Fourth Proportional to 671.10, 926.05 and 391.24

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Solution

The fourth proportional to 671.10, 926.05 and 391.24 is: 539.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.10 : 926.05 = 391.24 : x
  2. Step 2: Convert to fraction form
    671.10/926.05 = 391.24/x
  3. Step 3: Cross multiply
    671.10x = 926.05 × 391.24
  4. Step 4: Simplify right side
    671.10x = 362,307.80
  5. Step 5: Solve for x
    x = 362,307.80/671.10
  6. Step 6: Final answer
    x = 539.87

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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.