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Finding the Fourth Proportional to 392.69, 589.32 and 316.57

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Solution

The fourth proportional to 392.69, 589.32 and 316.57 is: 475.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.69 : 589.32 = 316.57 : x
  2. Step 2: Convert to fraction form
    392.69/589.32 = 316.57/x
  3. Step 3: Cross multiply
    392.69x = 589.32 × 316.57
  4. Step 4: Simplify right side
    392.69x = 186,561.32
  5. Step 5: Solve for x
    x = 186,561.32/392.69
  6. Step 6: Final answer
    x = 475.09

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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.