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Finding the Fourth Proportional to 465.16, 640.11 and 402.79

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Solution

The fourth proportional to 465.16, 640.11 and 402.79 is: 554.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.16 : 640.11 = 402.79 : x
  2. Step 2: Convert to fraction form
    465.16/640.11 = 402.79/x
  3. Step 3: Cross multiply
    465.16x = 640.11 × 402.79
  4. Step 4: Simplify right side
    465.16x = 257,829.91
  5. Step 5: Solve for x
    x = 257,829.91/465.16
  6. Step 6: Final answer
    x = 554.28

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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.