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Finding the Fourth Proportional to 465, 641.76 and 290.28

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Solution

The fourth proportional to 465, 641.76 and 290.28 is: 400.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    465 : 641.76 = 290.28 : x
  2. Step 2: Convert to fraction form
    465/641.76 = 290.28/x
  3. Step 3: Cross multiply
    465x = 641.76 × 290.28
  4. Step 4: Simplify right side
    465x = 186,290.09
  5. Step 5: Solve for x
    x = 186,290.09/465
  6. Step 6: Final answer
    x = 400.62

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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.