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Finding the Fourth Proportional to 871.34, 1,202.42 and 478.35

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Solution

The fourth proportional to 871.34, 1,202.42 and 478.35 is: 660.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.34 : 1,202.42 = 478.35 : x
  2. Step 2: Convert to fraction form
    871.34/1,202.42 = 478.35/x
  3. Step 3: Cross multiply
    871.34x = 1,202.42 × 478.35
  4. Step 4: Simplify right side
    871.34x = 575,175.22
  5. Step 5: Solve for x
    x = 575,175.22/871.34
  6. Step 6: Final answer
    x = 660.11

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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.