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Finding the Fourth Proportional to 578.62, 871.40 and 435.34

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Solution

The fourth proportional to 578.62, 871.40 and 435.34 is: 655.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.62 : 871.40 = 435.34 : x
  2. Step 2: Convert to fraction form
    578.62/871.40 = 435.34/x
  3. Step 3: Cross multiply
    578.62x = 871.40 × 435.34
  4. Step 4: Simplify right side
    578.62x = 379,355.28
  5. Step 5: Solve for x
    x = 379,355.28/578.62
  6. Step 6: Final answer
    x = 655.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.