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Finding the Fourth Proportional to 392.96, 591.72 and 290.96

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Solution

The fourth proportional to 392.96, 591.72 and 290.96 is: 438.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.96 : 591.72 = 290.96 : x
  2. Step 2: Convert to fraction form
    392.96/591.72 = 290.96/x
  3. Step 3: Cross multiply
    392.96x = 591.72 × 290.96
  4. Step 4: Simplify right side
    392.96x = 172,163.89
  5. Step 5: Solve for x
    x = 172,163.89/392.96
  6. Step 6: Final answer
    x = 438.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.