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Finding the Fourth Proportional to 718.40, 1,072.72 and 622.40

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Solution

The fourth proportional to 718.40, 1,072.72 and 622.40 is: 929.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.40 : 1,072.72 = 622.40 : x
  2. Step 2: Convert to fraction form
    718.40/1,072.72 = 622.40/x
  3. Step 3: Cross multiply
    718.40x = 1,072.72 × 622.40
  4. Step 4: Simplify right side
    718.40x = 667,660.93
  5. Step 5: Solve for x
    x = 667,660.93/718.40
  6. Step 6: Final answer
    x = 929.37

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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.