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Finding the Fourth Proportional to 578.76, 867.60 and 393.55

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Solution

The fourth proportional to 578.76, 867.60 and 393.55 is: 589.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.76 : 867.60 = 393.55 : x
  2. Step 2: Convert to fraction form
    578.76/867.60 = 393.55/x
  3. Step 3: Cross multiply
    578.76x = 867.60 × 393.55
  4. Step 4: Simplify right side
    578.76x = 341,441.81
  5. Step 5: Solve for x
    x = 341,441.81/578.76
  6. Step 6: Final answer
    x = 589.96

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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.