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Finding the Fourth Proportional to 465.28, 641.80 and 290.59

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Solution

The fourth proportional to 465.28, 641.80 and 290.59 is: 400.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.28 : 641.80 = 290.59 : x
  2. Step 2: Convert to fraction form
    465.28/641.80 = 290.59/x
  3. Step 3: Cross multiply
    465.28x = 641.80 × 290.59
  4. Step 4: Simplify right side
    465.28x = 186,500.66
  5. Step 5: Solve for x
    x = 186,500.66/465.28
  6. Step 6: Final answer
    x = 400.84

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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.