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Finding the Fourth Proportional to 479.79, 718.80 and 381.11

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Solution

The fourth proportional to 479.79, 718.80 and 381.11 is: 570.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.79 : 718.80 = 381.11 : x
  2. Step 2: Convert to fraction form
    479.79/718.80 = 381.11/x
  3. Step 3: Cross multiply
    479.79x = 718.80 × 381.11
  4. Step 4: Simplify right side
    479.79x = 273,938.27
  5. Step 5: Solve for x
    x = 273,938.27/479.79
  6. Step 6: Final answer
    x = 570.95

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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.