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Finding the Fourth Proportional to 871.70, 1,202.94 and 478.73

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Solution

The fourth proportional to 871.70, 1,202.94 and 478.73 is: 660.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.70 : 1,202.94 = 478.73 : x
  2. Step 2: Convert to fraction form
    871.70/1,202.94 = 478.73/x
  3. Step 3: Cross multiply
    871.70x = 1,202.94 × 478.73
  4. Step 4: Simplify right side
    871.70x = 575,877.45
  5. Step 5: Solve for x
    x = 575,877.45/871.70
  6. Step 6: Final answer
    x = 660.64

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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.