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Finding the Fourth Proportional to 392.90, 588.76 and 289.35

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Solution

The fourth proportional to 392.90, 588.76 and 289.35 is: 433.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.90 : 588.76 = 289.35 : x
  2. Step 2: Convert to fraction form
    392.90/588.76 = 289.35/x
  3. Step 3: Cross multiply
    392.90x = 588.76 × 289.35
  4. Step 4: Simplify right side
    392.90x = 170,356.98
  5. Step 5: Solve for x
    x = 170,356.98/392.90
  6. Step 6: Final answer
    x = 433.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.