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Finding the Fourth Proportional to 1,072.80, 1,609.35 and 487.79

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Solution

The fourth proportional to 1,072.80, 1,609.35 and 487.79 is: 731.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.80 : 1,609.35 = 487.79 : x
  2. Step 2: Convert to fraction form
    1,072.80/1,609.35 = 487.79/x
  3. Step 3: Cross multiply
    1,072.80x = 1,609.35 × 487.79
  4. Step 4: Simplify right side
    1,072.80x = 785,024.84
  5. Step 5: Solve for x
    x = 785,024.84/1,072.80
  6. Step 6: Final answer
    x = 731.75

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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.