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Finding the Fourth Proportional to 476.05, 656.49 and 289.57

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Solution

The fourth proportional to 476.05, 656.49 and 289.57 is: 399.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.05 : 656.49 = 289.57 : x
  2. Step 2: Convert to fraction form
    476.05/656.49 = 289.57/x
  3. Step 3: Cross multiply
    476.05x = 656.49 × 289.57
  4. Step 4: Simplify right side
    476.05x = 190,099.81
  5. Step 5: Solve for x
    x = 190,099.81/476.05
  6. Step 6: Final answer
    x = 399.33

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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.