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Finding the Fourth Proportional to 622.20, 935.10 and 611.40

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Solution

The fourth proportional to 622.20, 935.10 and 611.40 is: 918.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    622.20 : 935.10 = 611.40 : x
  2. Step 2: Convert to fraction form
    622.20/935.10 = 611.40/x
  3. Step 3: Cross multiply
    622.20x = 935.10 × 611.40
  4. Step 4: Simplify right side
    622.20x = 571,720.14
  5. Step 5: Solve for x
    x = 571,720.14/622.20
  6. Step 6: Final answer
    x = 918.87

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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.