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Finding the Fourth Proportional to 671.67, 926.91 and 392.10

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Solution

The fourth proportional to 671.67, 926.91 and 392.10 is: 541.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.67 : 926.91 = 392.10 : x
  2. Step 2: Convert to fraction form
    671.67/926.91 = 392.10/x
  3. Step 3: Cross multiply
    671.67x = 926.91 × 392.10
  4. Step 4: Simplify right side
    671.67x = 363,441.41
  5. Step 5: Solve for x
    x = 363,441.41/671.67
  6. Step 6: Final answer
    x = 541.10

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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.