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Finding the Fourth Proportional to 1,065.12, 1,469.85 and 622.94

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Solution

The fourth proportional to 1,065.12, 1,469.85 and 622.94 is: 859.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.12 : 1,469.85 = 622.94 : x
  2. Step 2: Convert to fraction form
    1,065.12/1,469.85 = 622.94/x
  3. Step 3: Cross multiply
    1,065.12x = 1,469.85 × 622.94
  4. Step 4: Simplify right side
    1,065.12x = 915,621.01
  5. Step 5: Solve for x
    x = 915,621.01/1,065.12
  6. Step 6: Final answer
    x = 859.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.