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Finding the Fourth Proportional to 671.15, 926.16 and 391.39

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Solution

The fourth proportional to 671.15, 926.16 and 391.39 is: 540.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.15 : 926.16 = 391.39 : x
  2. Step 2: Convert to fraction form
    671.15/926.16 = 391.39/x
  3. Step 3: Cross multiply
    671.15x = 926.16 × 391.39
  4. Step 4: Simplify right side
    671.15x = 362,489.76
  5. Step 5: Solve for x
    x = 362,489.76/671.15
  6. Step 6: Final answer
    x = 540.10

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Double scale
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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.