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Finding the Fourth Proportional to 476.39, 657.21 and 289.87

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Solution

The fourth proportional to 476.39, 657.21 and 289.87 is: 399.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.39 : 657.21 = 289.87 : x
  2. Step 2: Convert to fraction form
    476.39/657.21 = 289.87/x
  3. Step 3: Cross multiply
    476.39x = 657.21 × 289.87
  4. Step 4: Simplify right side
    476.39x = 190,504.91
  5. Step 5: Solve for x
    x = 190,504.91/476.39
  6. Step 6: Final answer
    x = 399.89

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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.