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Finding the Fourth Proportional to 629.94, 868.92 and 420.18

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Solution

The fourth proportional to 629.94, 868.92 and 420.18 is: 579.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.94 : 868.92 = 420.18 : x
  2. Step 2: Convert to fraction form
    629.94/868.92 = 420.18/x
  3. Step 3: Cross multiply
    629.94x = 868.92 × 420.18
  4. Step 4: Simplify right side
    629.94x = 365,102.81
  5. Step 5: Solve for x
    x = 365,102.81/629.94
  6. Step 6: Final answer
    x = 579.58

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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.