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Finding the Fourth Proportional to 500.94, 691.86 and 391.74

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Solution

The fourth proportional to 500.94, 691.86 and 391.74 is: 541.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.94 : 691.86 = 391.74 : x
  2. Step 2: Convert to fraction form
    500.94/691.86 = 391.74/x
  3. Step 3: Cross multiply
    500.94x = 691.86 × 391.74
  4. Step 4: Simplify right side
    500.94x = 271,029.24
  5. Step 5: Solve for x
    x = 271,029.24/500.94
  6. Step 6: Final answer
    x = 541.04

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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.