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Finding the Fourth Proportional to 470.12, 648.70 and 290.63

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Solution

The fourth proportional to 470.12, 648.70 and 290.63 is: 401.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.12 : 648.70 = 290.63 : x
  2. Step 2: Convert to fraction form
    470.12/648.70 = 290.63/x
  3. Step 3: Cross multiply
    470.12x = 648.70 × 290.63
  4. Step 4: Simplify right side
    470.12x = 188,531.68
  5. Step 5: Solve for x
    x = 188,531.68/470.12
  6. Step 6: Final answer
    x = 401.03

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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.