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Finding the Fourth Proportional to 476.27, 711.20 and 389.78

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Solution

The fourth proportional to 476.27, 711.20 and 389.78 is: 582.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.27 : 711.20 = 389.78 : x
  2. Step 2: Convert to fraction form
    476.27/711.20 = 389.78/x
  3. Step 3: Cross multiply
    476.27x = 711.20 × 389.78
  4. Step 4: Simplify right side
    476.27x = 277,206.03
  5. Step 5: Solve for x
    x = 277,206.03/476.27
  6. Step 6: Final answer
    x = 582.04

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.