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Finding the Fourth Proportional to 871.07, 1,202.09 and 478.08

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Solution

The fourth proportional to 871.07, 1,202.09 and 478.08 is: 659.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.07 : 1,202.09 = 478.08 : x
  2. Step 2: Convert to fraction form
    871.07/1,202.09 = 478.08/x
  3. Step 3: Cross multiply
    871.07x = 1,202.09 × 478.08
  4. Step 4: Simplify right side
    871.07x = 574,692.80
  5. Step 5: Solve for x
    x = 574,692.80/871.07
  6. Step 6: Final answer
    x = 659.76

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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.