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Finding the Fourth Proportional to 1,072.12, 1,607.78 and 422.50

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Solution

The fourth proportional to 1,072.12, 1,607.78 and 422.50 is: 633.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.12 : 1,607.78 = 422.50 : x
  2. Step 2: Convert to fraction form
    1,072.12/1,607.78 = 422.50/x
  3. Step 3: Cross multiply
    1,072.12x = 1,607.78 × 422.50
  4. Step 4: Simplify right side
    1,072.12x = 679,287.05
  5. Step 5: Solve for x
    x = 679,287.05/1,072.12
  6. Step 6: Final answer
    x = 633.59

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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.