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Finding the Fourth Proportional to 469.75, 648.39 and 314.50

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Solution

The fourth proportional to 469.75, 648.39 and 314.50 is: 434.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.75 : 648.39 = 314.50 : x
  2. Step 2: Convert to fraction form
    469.75/648.39 = 314.50/x
  3. Step 3: Cross multiply
    469.75x = 648.39 × 314.50
  4. Step 4: Simplify right side
    469.75x = 203,918.66
  5. Step 5: Solve for x
    x = 203,918.66/469.75
  6. Step 6: Final answer
    x = 434.10

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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.