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Finding the Fourth Proportional to 578.30, 868.66 and 491.62

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Solution

The fourth proportional to 578.30, 868.66 and 491.62 is: 738.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.30 : 868.66 = 491.62 : x
  2. Step 2: Convert to fraction form
    578.30/868.66 = 491.62/x
  3. Step 3: Cross multiply
    578.30x = 868.66 × 491.62
  4. Step 4: Simplify right side
    578.30x = 427,050.63
  5. Step 5: Solve for x
    x = 427,050.63/578.30
  6. Step 6: Final answer
    x = 738.46

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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.