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Finding the Fourth Proportional to 718.38, 1,076.22 and 392.76

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Solution

The fourth proportional to 718.38, 1,076.22 and 392.76 is: 588.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.38 : 1,076.22 = 392.76 : x
  2. Step 2: Convert to fraction form
    718.38/1,076.22 = 392.76/x
  3. Step 3: Cross multiply
    718.38x = 1,076.22 × 392.76
  4. Step 4: Simplify right side
    718.38x = 422,696.17
  5. Step 5: Solve for x
    x = 422,696.17/718.38
  6. Step 6: Final answer
    x = 588.40

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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.