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Finding the Fourth Proportional to 470.24, 648.64 and 313.06

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Solution

The fourth proportional to 470.24, 648.64 and 313.06 is: 431.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    470.24 : 648.64 = 313.06 : x
  2. Step 2: Convert to fraction form
    470.24/648.64 = 313.06/x
  3. Step 3: Cross multiply
    470.24x = 648.64 × 313.06
  4. Step 4: Simplify right side
    470.24x = 203,063.24
  5. Step 5: Solve for x
    x = 203,063.24/470.24
  6. Step 6: Final answer
    x = 431.83

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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.