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Finding the Fourth Proportional to 465.46, 640.64 and 340.92

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Solution

The fourth proportional to 465.46, 640.64 and 340.92 is: 469.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.46 : 640.64 = 340.92 : x
  2. Step 2: Convert to fraction form
    465.46/640.64 = 340.92/x
  3. Step 3: Cross multiply
    465.46x = 640.64 × 340.92
  4. Step 4: Simplify right side
    465.46x = 218,407.84
  5. Step 5: Solve for x
    x = 218,407.84/465.46
  6. Step 6: Final answer
    x = 469.23

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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.